Zocor and blood panel

I am 54 and began taking Simvastatin 20mg on Jan 11, 2008 my blood panel showed chol 319 ldl 251hdl 44 trig 118 on Jan 26 I experienced chest pain like I had swallowed an ice cube for fifteen minutes and thought it was a side effect of the Statin I went to the surgicenter and was checked in with Troponin at 0.1 after one hour there I had another pain and they gave nitro g and it continued the Troponin level went to 1.6 They sent me to get an angiogram and I ended up getting two stents. just before the procedure after not having eaten for 22 hours my blood panel was done again and my chol was 155 ldl 89 hdl 38 trig 136. my ldl had gone down 162 mg/dl in fifteen days. after two weeks now taking Plavix as well I began having extreme pain in my joints and both knees forearms and calves, so bad I can hardly walk and have been prescribed Darvocet for the pain. I want to stop taking the Simvastatin I am alarmed at the rate of decent and wonder if my symptoms could be a product of too low of cholesterol. I can't get a straight answer from three doctors I've spoken to. I'm being crippled by the cure