Internal Tremors? Don't know what it is caused by.

Hello.

I am a 22 y/o who within the past week have been experiencing severe internal tremors. I initially didn't know that's what they were called but its like when you are driving on a road and you go over a tarred over repair and theres a little bump. But it's constant. 24/7. This suddenly happened. Not to gross anyone out but I moved to a college apartment that is really old and live in the cold midwest so I saw a mice or two. At the time I didn't realize it was me doing the shaking and literally thought a mouse was climbing through my mattress it was shaking so hard. After checking every inch of that mattress and inspecting everywhere in my apartment, I realized there was no way it was and then realized it was me because I didn't stop shaking. That was about a week ago. Since then I have had non stop internal tremors. I am struggling to sleep. sometimes my heart goes a bit weird. I recently went on vitamin D 50,000 to take once a week and don't know if thats a cause. In addition, I have PCOS, am overweight, and have just above the limit to be high cholesterol. I also have anxiety but I personally don't believe this is anxiety because I can be perfectly normal and still have tremors, I have a doctors appointment scheduled for monday but am nervous its going to be brushed off. I can't live like this. About a month ago I had a doctors appointment and they did some basic labs and the only things off were the little bit high cholesterol, and low vitamin D, I can share whatever else they ran if that helps. I feel so distracted all the time. I can't stop focusing on the tremors. Sometimes ice helps. Sometimes heat helps. But not really. I feel like I am going crazy, my sleep is very interrupted, I am a full time college student. I need some help or tips if this sounds familiar to anyone!! Sorry for the word vomit. Not sure what to do. 🙁