No energy and struggling!

I'm a FTM but I understand that 30 weeks pregnant is recipe for exhaustion and no energy but I feel awful. I'm physically disabled so I'm very limited on what I can do as it is. And now these past 2 weeks I just don't want to do anything. My chronic pain aside, the smallest tasks are so overwhelming. I feel literally drained and it happened out of nowhere, I sleep about 12hrs every night plus a nap during the day. My blood levels are fine, I know that but I just feel really guilty for feeling this way. My SO is the main provider and I know it's not fair for him to work and then have to do most of the cleaning....he's very upset with me and gets mean about my sudden lacking in housework. Bending down into the clothes washer is nearly impossible with a big ole belly, picking up the floors is getting harder....he doesn't see that. He calls it excuses that I'm making. I'm starting to get really upset about it and wonder if something is wrong with me to not be motivated whatsoever. I cook dinner and clean minimally....that's it. Anyone else? Should I talk to my OB?