A question on the use of brackets. [Details inside].

I just asked a(nother) question on Fluther.
In the title I used brackets, like so: ”(You have the feeling that) You are being followed; (Men and women) What do you do?”
What is the correct way to use them, and where do I put capitals
“You have the feeling”, a capital, yes or no?
“You are being followed”, a capital, yes or no?
Will one of those (sentences) get/not get a capital because the other sentence got one?

I tried to find the answer on the net, but my knowledge and vocabulary on grammar is insufficient to grasp it, but you Jellies seem to always be capable to make me understand such stuff.