I don't know if this helps or not but I was similar to you (I think) as I also had early onset. Most of my problems seemed to be non-physical but eventually (after about 12 years) I started freezing/festinating & falling.
I was on Rasagaline, Amantadine, Stalevo (150mg) 3 hourly & occasional Dispersible Madopar but became so bad that I became a virtual recluse as I lost all confidence in going out after having a couple of scarey experiences of "freezing" in crowds.
I was also experiencing terrible mood swings and anxiety attacks - one minute I was on cloud 9, the next I was in the depths of despair. So I was prescribed Mirtazapin anti-depressants along with Zopiclone to help me sleep.
The trouble is, with such an amount of Dopamine being ingested (Amantadine combats this to a certain degree), it caused me to have dyskenesias - mainly in my left leg in the evening. It didn't really bother me as I was more worried about the freezing - but my wife was really embarrassed about it especially on one occasion when she thought EVERYONE was staring at me (I'm sure they weren't but you can't argue) whilst sitting in a restaurant one evening on a rare excursion out.
As I was beginning to withdraw from society (I really couldn't see myself EVER going on public transport again), I asked my neuro about DBS. She referred me to Prof Tipu Aziz, consultant neurologist at the John Radcliffe Hospital In Oxford. I was, by this time, very "twitchy" though I never experienced any tremors.
After assessing me over a few appointments, Prof Aziz's team suggested bilateral GPi DBS which would control my dyskenesias and they could then control my freezing with the Stalevo - STN DBS was not thought to be suitable due to my mood swings.
Anyway, to cut a long story short, I underwent surgery in June this year. It has, for me, been an incredible success - absolutely NO dyskenesias now, no twitching, my mood swings have almost gone (that took a little while - but, again this can be controlled by smaller doses of Stalevo but taken more often). I must admit that I DO, very occasionally have minor bouts of freezing but it doesn't worry me any more whereas I used to panic - I have recently returned to work on site as a bricklayer - the exercise certainly helps.
I have recently been to a premier league football match and felt fine among the crowd; went to a concert at the O2 in Shepherds Bush by public transport (although I did have a minor panic attack but overcame it); took the tube into Central London the following day to meet my son for lunch - all things I never dreamed of being able to do ever again!! It has really been as if my life has re-started!
So, although at the moment you probably feel the above doesn't apply to you, it may well do if you should start to suffer dyskenesias.
Hope it helps,