I’m not a doctor, and you’re smart to consider that this might be a medical issue. So call your physician, make an appointment and tell him or her what’s going on and ask their medical opinion. It’s always good to rule out medical issues.
Financial stress can be a bear, and it can definitely affect your sex drive and your performance, so whether or not you have a medical issue, you’ve focused on a major source of bedroom stress: finances. Obviously, if you can alleviate the financial stress, that’s your best remedy. Otherwise, don’t expect yourself to perform as you usually do because you’ve got this other challenge going on. In bed, focus on her pleasure first, now and then. Try new things and new situations so you don’t fall into the same sexual patterns that have lead you to this outcome.
There’s not an easy fix here, but if you try these three things (see a doctor, focus on her, and try new things), you may come up with other ideas that will work, as well. It’s a process that’s well worth the work. 😉