Tramadol Hydrochloride and 13 years

I have had numerous side effects with tramadol (nausea, heart skipping beats, restless legs at night) but I was too desperate and needed something so I just started taking 2 half pills a day (total of 50 mg). Well, now I've quit after about 2 years because I have sudden onset swelling and tendinitis in both of my achilles tendons. There was absolutely no trauma involved and tramadol was my only medication. After doing research online, I found that this is a rare side effect to some other medications but it hasn't been mentioned for tramadol. I truly believe this is a side effect that just hasn't been reported yet. Also, it can lead to both tendons rupturing. I just hope I stopped the medication in time so that it doesn't lead to that. It's only been a few days and I have a lot of pain and difficulty with stairs. I think this will take a while to get over -- like all orthopedic related problems.