light headedness AFTER coming to a stop

[fouragreements]

I'm 34, male, slightly overweight.  For the last month, I've had the weird sensation of feeling really faint when I come to a STOP after walking a short distance.  While I'm walking, I'm completely fine.  I stop (like, waiting for an elevator), and then for at least 30 seconds, I feel like I might faint.

I had chest pains two months ago, followed by normal EKGs and a normal heart stress test.  I immediately stopped all caffeine and alcohol consumption, and with dr's approval stopped taking Crestor and Zetia.  Had LUQ pain & no normal bowel movements for a month (all gas/diarrhea), and had a colonoscopy and upper-endo, and tests for dehydration, liver, kidneys, pancreas, blood sugar, anemia, and carcinoid--they've all been normal/negative.  

When the fainting symptoms started a month ago, I got my doctor's approval to stop Norvasc.  

I've been under heavy stress (new job, move, etc.) and was treated successfully for depression in the past (2002) w/zoloft.  They think my bowel symptoms might be anxiety-based, so I've been on librax and zoloft for a week, and the bowel situation seems to be slightly improving.

But the faintness--I had that before restarting the librax/zoloft, for the last month.  I've had no fevers, and seem otherwise healthy.  I have no signs of ear infection, according to my dr.  I'm eating a little less than I used to, but have otherwise-healthy eating habits now.

The only other unusual thing I've noticed is my resting HR seems really low (48 BPM) for someone who's just in so-so shape.  I'm certain it was never that low before.

Any ideas?

[paulpt]

48 bpm is pretty low.  That's Lance Armstrong like.  If you are some sort of endurace athelete maybe that's normal for you, otherwise I would think either you're not measuring your HR correctly, or that might be a clue to your light headedness.  I think normal resting HR for most people is in the 60-70 range.

[fouragreements]

Oh, also, thyroid and BP were also normal.