Hi Deej,
Like the previous poster said, we are here to listen and share. I can empathise with you since I have multiple dislocations in my joints each day and they cause micro trauma which builds up, and also has led to tendonitis at a few sites, on top of the pain from the dislocation itself and the other sh*t. I don't mean to moan either, just sounds like it when I explain my situation! So I relate there also

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What I will say is that the type pf pain which hits you like you describe and sort of deals a blow unpredictably throughout the day getting more severe than the underlying pain thing, well it does sound like tendonitis etc, as I am sure you probably know. The thing is injuries like these need time to heal and the chronic ones sometimes need tendon release, something I have been scheduled for in the past but which is not an easy option now a days with a chair. The rest can be tricky too.
I would suggest that perhaps you see about getting a splint for "tennis Elbow". There is info
HERE which lists the symptoms so you can refer to see if its is likely to be Tennis elbow or perhaps Ulnar impingement etc. Finding out what it is may be in the bag if its the same as years ago though, so sorry if this isn't any use. Hopefully any days you have to spend off can be used to try and rest your arm (as much as us chair users can).
I hope that you find some relief and it goes as quickly as it came, I hope it isn't the same issue as b4 which required surgery and that you get to catch a break so to speak!
Hang in there! Hopefully you have had your share of the cruddy issues for a good while now ( its what I try and tell myself!, lol

)
Let us know how things go,
Take care,
K