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Heavy1 said..
Hi. There are many different types of shoulder injuries, but as you have not mentioned dislocation, arthritis, or collar bones I am assuming its a rotator cuff injury. The two most common are long head of biceps tendonitis, and supraspinatus tendonitis. The long head of biceps tendonitis will give pain holding the arm outstretched in front of you or flexing the biceps. The supraspinatus will give pain lifting the arm out to the side and especially over shoulder height. Lifting anything over head is the biggest issue but even holding the arm out in front of you to use a computer mouse can cause or exacerbate it. Fortunately the usual pulling the boom towards you actions while windsurfing is relatively OK. Up hauling can be an issue, as can some movements requiring you to twist the arm. The biggest issue is probably lifting the board on and off the car.
What has worked for me is to rest it by avoiding using that arm to steer the car, or hold children etc. But also to be careful to hold the mouse etc in a ergonomic way, or swap hands (?? maybe holding a painting brush in your case, painting walls is certainly a big issue). A good 5min of stretches of the tendons at issue before windsurfing is important. The time I feel I'm most likely to flare it up is lifting the board onto the car. Work out alternatives.
You can have cortisone injection which definitely speed recovery, but if you have too many the tendons can rupture. The new technology of concentrating your own platelet serum as an injection works wonders for some but is expensive and doesn't always work.
I've found paddling SUP or kayak much worse for the shoulders than windsurfing.
So in summary don't give up windsurfing except in the most acute phases. Try to get your harness lines well balanced and always stretch before going out. Good luck and update us if you find any special solutions.
My clavicle and surrounding tendons are inflamed so I'm trying not to use it ( hard due to the large number of muscles involved) + ice + exercises to improve my posture and stop my default habit of using those muscles when I shouldn't..

. Also taking herbal anti imflammatories. Due to an internal bleed last year from prescription ones I'm not allowed to use them again.

It has been 2 weeks so far and it's settled down although all I have to do is lean forward and reach or turn my head to get sharp pain..Keen to try and paint again but I know after 10 mins it will be all stirred up again.
Plan is to keep trying to not stir it up ( boring..zzz) and when ready start doing exercises to build me up..my biceps were like little rocks..now they've disappeared..

hoping for about 6 weeks ( insert praying icon)..

Grr looks like I miss the winter westerlies for the second year in a row..