@tami1966 First, welcome to Mayo Clinic Connect! I am glad you found us, and @jakedduck1 has offered some very sound advice based on his experience.

It's gotta be perplexing to you, to see these symptoms. I also get the bruising you pictured, and sometimes even remember that it will happen when I run into something, saying "oh, that's going to leave a mark!" As we age, our skin also ages, and gets thinner, more prone to bruising and disturbances. At 68, there often are marks I cannot give a cause for, but I also have several autoimmune issues, and sensitive skin. The myopathy may be an aftereffect of the hit to the area.

As for gabapentin side effects, here is a link to Mayo Clinic's information about gabapentin, that you might find useful https://www.mayoclinic.org/drugs-supplements/gabapentin-oral-route/side-effects/drg-20064011?p=1 You haven't said what the original reason for this medication was, but I have to wonder if your system has grown so used to having this, that it is no longer effective for the original dosing? You'll see under "precautions" some of the things you are experiencing.

Let us know what your drs have to say. Are they considering changing your gabapentin dose? How will your 27 year career end if you do not find answers?
Ginger