Grief: My 'bad' coping mechanism experience

2 years ago, my sister suddenly was effected by an idiopathic lung problem. She ended up working with the University of Washington - possible heart/lung transplant. She fought very hard and tried to continue an independent life. ( I'm states away). She was also diabetic. She was trying real hard to better herself.
Last Christmas, I did not hear from her. ( Her and I are our only blood family). Finally got a hold of her. She said she slept 4 days - thru Christmas. Ok, she did sleep a lot due to being weak from the lung issue. I am use to her sleeping a lot. We had a good talk, she sounded good and said she was going to get up and get some food. Days past. The pause on her phone to get to the answering machine got longer. I had a gut feeling. BUT I was really trying to give her support for being independent. Time passed and no response from FB, phone or messages. Gut feeling. BUT, IF I called in a wellness check and she was just sleeping, she would have killed me if her door had been broken down and she was asleep in the chair. Maybe she was feeling good and went to the casino and was tired after that and was resting...? Well, Jan 9th, I called in a wellness check. They found her dead in bed.
Have no idea how long she was there. No autopsy but I put things together and figured, since she was sleeping so much, she wasn't eating or taking insulin.. she went into a diabetic coma.

So, I had to fly out to Seattle and 'take care' of things. I held it together during the day, but the nights... I went thru 2 bottles of Jack and took 2 mg of Klonopoin at night.. the nights were mine.

Fast forward to May 24th. Her funeral at the national cemetery - clear across the state. Lots of turn out from people all over the country. I held it together well.

the next day when we left for home, the interstate goes right by the cemetery. I looked up at it and just wanted to scream. I have been low before, had my share of hospital stays from mental breaks and lows. But NOTHING like this. Something was over me. I couldn't figure out how my heart was still beating and I felt so bad. It was like something came and took my soul. I was pretty messed up when my sister died.. but NOTHING like this.. very unfamiliar with it. They say there is no pain like the pain of a mother losing her child - I have SEEN this pain with a good friend when she lost her daughter - seen her body laying on the bed when I'd check in on her.. but there was a bad ' thing' surrounding her. She was not there. I think this is what I was feeling.
My step dad was in the back seat. ( I had a friend drive out with me so I wasn't driving). I could NOT let him see me break so as not to upset him. I Bawled silently all the way home.. across the state. Getting out of the car at gas stations and rest stop and letting it out a bit - but not so much as for someone to call the police.
Got home, I asked IF I could stop at the liquor store,, NO! fine,(now, I didn't want to kill myself.. just needed NOT to feel this thing. I am trying to be sober.. so ok.. I bawled HARD for almost 2 hours. Until my body just couldn't do it any longer. SO, my next coping mech. is cutting. I had an over hour fight with a razor... I won.. I actually got up and put it away. So, what to do???? I had my meds on the shelf. I have NEVER abused my meds. But,, I needed that 'thing' to go away. so... (somehow I came up with a stupid calculation of mg. that wouldn't kill me.) and I took 6-7 mg of Klonopin with a handful of meletonin just to kick it in. I did this for 4 days. Day 5 ,(wed) somehow I took myself to the ER. I don't remember ANYTHING ( well, 2 small things) of those 5 days. I even traveled an hour and a half to the town where my 'phsyc' team is and had an emergency chat with one of them.
I found out today about that day, she tried to get me to go to the hospital.. I didn't. I went and got 2 tattoos ( needed to feel some physical pain). I fell asleep for both.
One of those days of the week, I even went to my phsyc Dr and explained the ER trip. ...??? I drove 2 times out of town, I have NO remembrance of this....
I"m just like WOW.. I went to the ER in some state and never saw a Dr ( this was ONE of the things I remember as I was waiting to see who my dr was going to be - didn't want it to be a certain one- and I remember trying to focus on the name tag of the girl who gave me the IV.. she was not a Dr.
I scared myself. I don't know how I feel about that whole episode. I actually didn't think about it till last week,, realized I blacked out several days....just WOW.. looking back.. how could the ER and the therapy clinic let me go.. I must have been very high functioning... ???

Just had to share..
and when I do see my primary again, I am going to ask her to read me the ER note from that day.. ...

This THING that had me, didn't want me to die, it wanted me to suffer.. it took me to the gates of Hell.