PFO Closure one year on and Propranolol

I had my PFO closed on the 4th July 2007 and have only had 3 migraines since, one really bad and two not so bad.  I was wondering if anyone can advise me on something.  Since the Procedure last year i have been really tired all the time, i just don't have any energy?  I'm not sure if it is the implant which has caused this or because i am now on Propranolol.  I only take 5 mg daily as i have a low intolerance to medication and this seems to have sorted out the irregular heart beats and may have also helped with the migraines.  If anyone has any info it would be greatly appreciated.

I had Accupunture also for about two months and this helped for a while also, but i would go with no headache and then come out with one which wasn't good.

Thanks

Diane