chest/left arm pain hart tests ok except some blockage

same symptoms for 2 mo. ekg ,ct scan and blood tests are fine.
sudden left arm ,left chest through back and throat pain, sweats.bp at time ave.-140 over 90 rate 88-110. dr says im fine.but still did hart cath.finding 50% and 35% blockages.
proscribed meds-vytorin eve.-mininitro patch -protonix and toprol daily. since on meds i still have episodes 3-4 times a week of pain starting in left arm and throat. i take baby asprin and sometimes nitro tab.pain goies away slowly.but dr. still says hart ok! pain in left arm most of the time last 10 days.i am a 49 yr old male with history of hodgkins douring youth and ITP in teen years with a spleenectomy.should i seek another dr.?