This was through an independent broker right? I hate those guys (the shady ones anyway). What he did was standard predatory lending practice. You should have been credit qualified within a day or so of you submitting the documentation he requested of you and he should have locked the rate in with the investor at that time if you had the equity showing based on your home's tax value.
You really need to look at your loan paperwork to check on the terms (which he should have gone over with you in detail on what adjustments would happen when).
LIBOR is at 4.9% or so right now; that's your "index" and it changes daily. Your "margin", is apparently more than 3%, because that is what you add to the index to get what your new adjusted interest rate will be. The "margin plus index" is controlled by the rate adjustment cap and maximum adjustment, usually 6-10% above your original note rate, (which are listed in your terms of loan paperwork).
If LIBOR is/was at about 4.9%, your original rate was 5.75% and your new payment is 8.75% that means you have a 3% rate adjustment cap and a margin that is even higher. It can't go all the way to "index + margin" now, assuming LIBOR stays fairly stable (it has been in the mid-to-high 4's all year IIRC) your next adjustment wouldn't be as painful.
But bottom line, you need to get out of this note and you need to avoid the "best rate" nonsense and go to your bank or credit union or a reputable, established (probably large) brokerage who won't be playing games.
There's no reason a self-employed borrower who
claims it on their taxes (you can't cheat uncle sam and then expect people to lend you money) can't get a prime rate (fixed or adjustable) mortgage with no fuss and just a little more paper work. Make sure they give you a signed good faith estimate and truth in lending statement within 3 days of the application being completed (per federal law). When they talk about rates and you finally choose a program, make sure they put in writing (and signed) that your rate has been locked with the investor and will not change.
If your income is hard to prove, they may talk about stated income or no income products. These loan types do have an additional up front fee and require good credit scores but they can be an easy solution if you've been writing off every debt against your business and can't show a profit. They are not rip-offs.
check out
http://www.mtgprofessor.com for about the best collection of mortgage advice and calculators you could want. Read it beforee you go shopping and then read about what the originator is offering you. There's no hurry and ANY refi can be backed out of for 3 business days after signing at the title office (right of recission) with no money lost except what you've paid up front (and is documented as non-refundable). You got caught in the "we're so far along" trap. Don't do it again.
feel free to email me with any other questions. I'm not the best there is but I love my job.