Nausea after showering

I have been getting really nauseaus immediately after taking a shower.  I cannot find any information about what might be wrong.  I dread taking a shower anymore because of this.  I usually have to sit down (a lot of times before even drying off) because it also makes me lightheaded.  Anyone have any ideas what might be causing this?

[Cosmogal]

YES!!! The heat causes your blood pressure to drop. You are probably pretty low. Try increasing your salt intake! yep salt! Increase your water intake too. I have low blood pressure and if I don't keep it up I get that way. Almost passed out in the shower before. I asked my doctor why this happens and he diagnosed with low blood pressure. Keep the door open to your bathroom open also to let the steam escape too. I hope this helps you!
Paula