Unfortunately it seems that you’ve mismanaged your condition, ignoring early signs, treating it as you would a muscle strain instead of an overuse injury and left it a bit late too see a physio.
You probably weren’t ready yet to start aggravating movements again and evidently it wasn’t slow enough
Should’ve stopped after one session not persisted for weeks.
Lessons for next time ey?
Repeated stress and overuse are the drivers so strategic rest and activity is still the best conservative intervention.
Like you’ve said while you’re not 100% yet but the trend is still getting better which is rather encouraging. Even with a couple of flare ups over time it seems you’re headed towards full recovery.
Had Golfer’s Elbow myself while working at a Butcher’s due to awkwardly carrying trays of meat. Stopped working there and it went away in time. I don’t sense that’s an option with lifting.
You already have the gist of what to do and some treatment examples from your past physio. All I can add is to play it smart/safe and be as conservative as possible. There’s no going too slow in your case. Try not to stop going to the gym completely because you’ll probably drive yourself insane.
Also some of the stuff listed below may be of help.
Consider differential diagnoses (similar symptoms/presentation):
Referred Pain from the Neck
Nerve Entrapment at the Elbow (Ulnar Nerve)
Joint Pathology e.g. Inflammatory Arthritis or Ligamentous Instability
Loose Bodies intra/extracapsularly
Modify form: probably pulling with the forearms muscles too much or curling with bent wrists loads up the forearm flexors excessively
Change Exercises/Reduce Volume: curls are probably not your friend especially your generic bicep curls. Likewise 10x10 curls is not a bright idea at least not for the foreseeable future
Use Straps: minimise work of affected muscles/tendons. eg figure 8 straps can enable you to pull with actually gripping anything with your fingers
Minimise stress/overuse outside the gym e.g. Occupation, Recreation etc.
Facilitate tissue healing e.g. Cease smoking, hot/cold therapy
A cortisone/corticosteroid injection may give some relief tho at this stage it’s no guarantee because while it may bring down inflammation the underlying degenerative processes in the tendons themselves are still present.
Not uncommon for chronic cases to last up to a year. It’s almost been one year so you’re possibly looking at surgical intervention if you’re unsuccessful with conservative management.