Is it even worth it to continue paying your credit cards on time if you're in my situation? HELP!

Ok, so I have posted several questions in regards to my credit card debt and am still very unsure of what direction to take...I have about $30,000 in CC debt with two companies..Citi & Chase...recently Bank of America closed my $11,000 and $5,500 credit lines that I had..their reason was due to being maxed out on my other CC's, although I have never been late on a single payment for ANY of my debts including mortgage and car payments . So at this point I have a pretty foul attitude b/c to my understanding creditors issue you credit so you will use it and of course repay the debt back..which I do on a monthly basis...so now apparently my existing debt is having an adverse affect on my credit and preventing me from obtaining or even keeping any additional credit so therefore I am questioning wether or not it's even worth it to keep paying my monthly CC payments which total over $600. Nobody will give me a credit line or loan large enough to consolidate my bills and I am a homeowner but don't have equity...so is CCCS or bankruptcy the best avenue for me?