Fat & muscle wasting

Hi guys- I have been experiencing the worst symptoms imaginable since February after undergoing some sort of systemic event from an injection, and I’ve just been declining and declining since. One of the worst symptoms is the rapid muscle and fat loss. I’m in Canada so it’s already extremely difficult to get any sort of healthcare here, but I’ve done bloodwork back on April 1st and my doctor told me everything is seemingly normal. Well, this past week I started to rapidly decline even faster than before, and after googling all of my symptoms, they match hyperthyroidism perfectly. One of the main symptoms I have is exercise intolerance, which for me makes no sense because I was extremely active, moving all day long, gym atleast 5 days a week, starting my competitive powerlifting career, going on hour long runs daily. I lived and breathed movement. Just at the start of February I was literally squatting 4 plates for sets of 10 reps. Like I had zero problems and I felt the strongest I’ve ever been. And now, I can barely do basic lunges. I’m out of breath just walking to the mailbox. And after attempting any small excercise I feel 10x worse after. My fat cells are metabolizing extremely fast all over my body, including my face, which is the worst part. After discovering that many of my symptoms match hyperthyroidism perfectly, I decided to take a look at the bloodwork from April 1st myself, and I notice that my TSH was on the lower end at 0.4, and when I had this bloodwork done on April 1st, I was only in the start of my symptoms, and they were not nearly as severe as they are right now. I am suspecting it has dropped significantly lower so I am booking an appointment with my family doctor to request a thyroid panel, however, I’m in Nova Scotia Canada, so if the panel comes back showing hyperthyroidism, then it’s still gonna take foreverrr to see an endocrinologist here. Likely 1-2 years. And my muscle & fat is metabolizing extremely fast, and I need to be able to somehow slow it down while I wait for a specialist who can help further.

So my question is, is there anything I can take that doesn’t require a doctor’s prescription that can help slow down the metabolism aspect of this? I’m already eating in a surplus of calories and following a high protein antiinflammatory diet but no help. Does anyone have any idea how I can slow this wasting process? Is there any supplement or otc medication that could help even a little? Please let me know, I appreciate it so much