That seems like an awful lot of medication. I take Citalopram and was told it can actually make me feel more energetic, so I take it in the morning. I also take Clonazepam for insomnia, and 1 mg knocks me out within 10 minutes. It is a "hypnotic" drug, and in my non-expert opinion would be the most likely med to cause your dizziness.
You seem to have your meds pretty spread out. Have they ever considered changing your captopril to one of the ACE inhibitors like lisinopril, can be taken once daily? I have lisinopril and diltiazem. I know the beta blockers and, I believe, the hydrochlorothiazide can produce tiredness, as can clonazepam. I don't think citalopram has any effect on tiredness.