There is no such limit on the number of times you can go for home refinance loans. Most lenders prefer that you have no late payment for the past 12 months before you switch over to a new loan.
Don't fall for the 0% apr unless it fits in with your master plan. A lot of brokers will try to get you locked into a low interest rate that will balloon on you in a couple of years and leave you out on the street.
Many people with poor credit history look to take out loans from friends and family. While this may be a fairly good short term solution, it might not be the smartest of long term business moves. What you need to do is refinance your mortgage and lower your payment. The best thing you can do for yourself is to shop around. I'd be willing to bet that some banks will give you a better deal on a mortgage refinancing than you think they would. Find out who's got the best rate to get the best deal on your loan. This might take a little legwork, but it could pay off. Finding that right bank to give you the right deal on your refinancing will be worth the effort.
You can ask for a copy of your settlement cost papers (the HUD-1 form) one day in advance of your loan closing. This will give you a chance to review the documents and verify the terms.