Sex life dieing!!! Help me!!

Before I got pregnant we had a good sex life...like 2-3 times a day. It went to once a day during the first trimester and beginning of the second trimester. Then it was maybe 2-3 times a week from end if the second trimester. Now I'm 33 weeks pregnant and we have gotten down to MAYBE once a week. Last time we had sex was last monday or tuesday. Its not me...I'm up for it, but he just doesn't seem interested. I don't even think he thinks about sex anymore. This morning I woke him up by wanting to rub his private... But he quickly threw my hand off it once my hand even touched it....I put my hand back on...and again he shoved my hand away. Idk what wrong with me..I know the sex hasn't been that great lately because I can hardly move and its extremely uncomfortable with my big belly. But he doesn't help any because he refuses to change positions. He refuses to do anything but missionary. We might go doggie for a little while but he quickly goes back to missionary. Right before going to (once a week) he was getting kinda selfish and he would want me to give him head and then finish him off on top...he didn't want to do any of the work. And we go from that to .....nothing...idk what to do because I'm missing physically touching my husband. Advice please