Testing beta blocker waters - MVP, skipped beats

Background:  I'm a 40 yr old male, 6'1" 170 lbs.  Diagnosed with MVP 14 yrs ago and confirmed again with a stress echo in Jan. that it's 2 leaflet MVP with mild regurgitation.  I also feel skipped beats (throughout the 14 years) and some can be very pronounced.  My cardiologist put me on ramipril and water pill 18 months ago after presenting with 160/110 twice in 3 months.  In January I felt a run of skipped beats(~4 in a row) out of the blue and felt dizziness.  Saw my cardio that day and he ran a battery of blood tests  -- all normal except for 250 cholesterol.  (im now on 20 mg lipitor and cholesterol is 137 with good/bad chol. in normal range in March). He took me off water pill and put me on Toprol xl 100mg.  Was on Tprl for 3 months until i started to feel tired/lethargic/lightheaded last week.  He took me off Toprol 2 days ago and I did a Holter monitor yesterday. -- results back next week.

Questions:
1) is it unusual that it would take 3 months for me to feel the worst of the tired/lethargic/lightheaded side effect? (I felt it in the 1st month as i adjusted but not near the levels I felt last week)
2) getting off Toprol cold turkey... Was that the right move?  I've felt racing heart, big skipped beats (caused me to feel dizzy in my head) and continued lightheaded spells.  He said weaning off Toprol wasn't necessary as I don't have coronary artery disease.  He wants to see if lightheadedness goes away after being off Toprol.
3) how long before Toprol is out of my system?  Been 2.5 days since my last dose.
4) anything I should ask specifically when I get the holter results next week?

Thank you!

[Cleveland Clinic]

1) This is a common side effect of toprol but usually does not last 3 months. There may have been something else going on. How many episodes of SVT were you having? It sounds as if you need either a calcium channel blocker ( verapamil or diltiazem) since you did not tolerate the beta blocker, or an EP study and ablation which can be a cure in the vast majority of patients, with very little risk at all.