I know how frustrating it can be to wait and wait and wait. Your bank is more than likely like most others experiencing very high volume of loans both new purchases and refinances. As an agent that works closely with certain lenders, I have specifically been told that if I am writing a contract for a home especially if it is an FHA loan, I should be writing it out for closing in at least 45 days. Underwriters have applications piled high on their desks and are moving as quickly as they can. I have seen them turn things around quickly once they get to them but it can take close to the full 45 days in some cases. If you went through a specific loan officer I recomend making sure you are in contact every couple days and for the time being, no news may be good news.
It never hurts to get the opinion from another lender though however they will more than likely need the same amount of time to get the loan approval. If you have good credit, job history of at least 2 years and enough savings to cover any closing costs and down payment, you should be fine. Good Luck!