hi and welcome. i have been dxd for 20+ years and have run the gamits on meds.

couple suggestions..

most important.. keep a medication journal. document when you take your meds, what you are feeling when you take them, and what you feel 1 hour afterwards. this helps determine what is symptom and what is side effect from meds.

ask your neuro if you can go on sinemet 25/100 instead of 50/200. even possibly a cr dose. cr has 75% of the levadopa in it and is time released. in my opinion you are on a very high dose of sinemet. but, this needs to be monitored by your doc. are you seeing a movement disorder specialist?

amantadine can cause anxiety and restlessness. this may contribute to the gait problem. there is a liquid amantadine which is an easier way to take less of it.

are you sleeping alright? relaxation is vital. try to make your place of sleep as peaceful as possible.

hang in there.. keep close tabs on meds. monitor and do research. get yourself familiar with your body and everything it does. keep notes..