Well Unfortunately the search function is a little messed up right now, I can't look at your past posts (and I've been MIA), so my reply might be way off base. So be it.
RE: IBS . What do you eat? When do you eat? Have you tried eliminating various foods from your diet to see how your body reacts? The biggest offenders out there are wheat, corn, soy and dairy. Try various dietary styles and see if they agree with you.
The fatigue could absolutely be diet-related.
Also- listed under potential side effects for paxil is decreased libido.... !!
And to me it sounds like you need to get your mojo working again. What turns you on? In life. What do you enjoy that you've neglected/let go because you are too busy/have too many responsibilities/etc, etc, etc? What did you enjoy as a child?
Maybe hippy-dippy, but you need to enjoy life/yourself FIRST. Before you can even think about pleasing a partner.