I get dizzy when I dismount. Causes?
It sounds like you over-exerted yourself and "bonked"&nbsp;&ndash; your body ran out of sugar so you fainted. In that case, you reduce the risk by eating more while you ride* and by listening to your body more and backing off when it's getting too much.

It may also be blood-pressure related: people with low blood pressure are (as I understand it) more susceptible to fainting. Since you're on blood pressure medication, you should talk to your doctor.

I don't think bike fit is really a contributor but, of course, improving that would make you a happier, more comfortable cyclist so you should do something about it even if it doesn't help the problem you most want to fix.



* In this context, snacks are not evil and you should eat them. Or, if your username indicates that you are the snack, consider eating yourself. However, this probably isn't a long-term strategy.