Not sure which to stop using. Advice PLEASE!

[beatlemike]

Im a 65 year old male who has been using 1 ml minoxidil 5% twice a day for about 20 years with no side effects. About 5 months ago I started using finasteride1% once a day and started using 2ml of minoxidil twice a day along with rollerderming once a month. I gave up rollerderming about 2 months ago. About 3 weeks ago I started getting severe lightheadeded ness and feeling like I was going to faint. Doctor said I checked out ok. So I stopped using both minoxidil and finasteride for a week and my symptoms dissapeard. I started using both again and was ok for about 3 days and the vertico returned. Which one should I try to give up first to see which one is causing it? Which one do you think is causing my problems I hate to give up either one but the dizziness comes without warning and Im almost afraid to drive or go shopping with my wife.