jesus that gives me the shivers. im 19 and most days somethin hurts. course, i accept that i’ll probably be hurt by your age.
nonetheless, i believe in total body foam rollin every day, but especially on the legs. if your legs are in shape, your upper body will be way better. having a solid and effective base is essential for healthy lifting.
another options would be to tone it down a bit. all of a sudden your body just got launched back into workout more, and while your muscles may be responding quickly your tendons and ligaments arent exactly young. take your time gaining weight/gettin stronger again, you got the rest of your life to get jacked.
dial in your diet as much as you can (a little bit more than you want to) but keep yourself positive and happy. sleep is essential, maybe try yoga/pilates. with the latter to, quality of instruction beats convenience.
mobility and general warm up work before every workout, stretchin after. total prologue and epilogue workout time should be around half you weight time. that means warm up and cool down.