Financing regulations and rules have changed a lot since 2008.
That may be hard to understand and accept but the billions of dollars of foreclosed mortgages in California, Nevada, and Florida, not to mention every other lesser location, caused massive failures within the banking system, collapsing the single largest mortgage provider, Countrywide, into Bank of America, for example.
We didn't see the run-up in prices in Texas and didn't have to same level of profligate lending that were widespread in those place, but we did have our share of abuses.
These days financing is the biggest single cause of contracts going bad. Last year 580 was acceptable as a credit score. 0% down was acceptable. Now, you need at least 3-1/2% down and a 620 credit score.
The good news is that rates are low. If you can qualify for a loan (in January you did), your payment would be better now anyhow, most likely. See if you can get pre-qualified again with a lender. You may be surprised by a lower monthly payment. The cash down payment, however, is never going to be below 3.5% unless you are a veteran or the house is located in a rural area.