Can I get a revision and how much it would cost me?

I'm sorry to hear you're having difficulty with your gastric bypass surgery.
Gastric bypass can be an extremely effective at helping people lose weight. This can significantly help reduce other serious health issues related to obesity including diabetes, sleep apnea and others.
Most of the physicians on this site are not general surgeons. It is a general surgeon or a bariatric surgeon (a division of general surgery) that specializes in the concerns you have.
You should seek a board certified general surgeon for advice on this.
I hope this helps.

This is a complex surgery and not likely performed by most surgeons on this website.
I would highly suggest contacting your personal physician and asking for referrals.
You clearly want a surgeon who has been performing this type of surgery for many years and have experience in performing revisions.
In some cases they may chose not to pursue a revision but instead to perform a different bariatric surgery procedure, such as a gastric lap banding.
I wish you luck in your pursuit and success in losing weight.

You should not be embarrassed, first your surgeon would need to evaluate to understand your current situation with the bypass and figure out the best options to help you.  For example; can eat a similar volume of food compared to before the surgery,  then the focus would be on increasing restriction  to lessen  the food  quantity  intake (a gastric band is great at creating restriction in bypass patients), if the problem  is not related to  the amount  then the focus should be on nutrition, and if necessary conversion to another form of procedure.  A complete evaluation with a bariatric surgeon with experience in revision surgery would be the first step to figure out what the best option is.