Try exaggerating your stretching and warm up prior to throwing ... increase your H20 intake on a regular basis, not just around your playing time ... make sure you are getting enough good fats in your diet (omega 3's), and most importantly, take enough rest when needed rather than trying to 'work through it' ... if condition/symptoms persist, or do not seem to recover in a reasonable time, consider seeking professional consult ...
At your age, quite possibly a wear issue, especially if intensive sport/athletic involvement your entire life, and never having any monitoring or repair work done ... I am 60 now, played baseball (catcher) and hockey (goalie) all my life well up into adulthood, and body took a major beating ... was involved in construction work almost all my adult life, and 40's-50 did several competitions as a (natural) body builder ...
Right shoulder has been completely rebuilt, so I am very careful how I use it, and both knees are junk, but oddly enough, the right forearm seems to be the problem area for me with DG... so bad that while I am trying to let it recoup, I have been throwing LHBH (normally RHBH) ... if you were ever a right handed batting baseball player, this is not as much of a stretch as it seems, and after just a couple weeks, I am almost throwing as far LHBH as I was RHBH ... consider trying this while letting your right shoulder rest ...
In effort of full disclosure, I was certified as a Personal Fitness Trainer and in Sports Nutrition back in my 40's, but certs' expired years ago ... if you are concerned about the re-occurence of your condition, or feel a preventative look is a wise choice, always consult your medical professional of choice ...
Try lefty though, it is kind of eye opening on how discs react and form works from the other side... it has helped me understand flight characteristics better seeing it from both sides ...