My SO...

My SO keeps hinting at that I don't give him head as much as he gives me or that we don't have sex a lot like I said I would have wanted in the beginning of the relationship. 
My problem is with the weather fluctuating as it is I get sick all the time. And sometimes I don't feel like it. Or I have to take an antibiotic and get a bad yeast infection even though I eat a lot of yogurt. 
I'm not making excuses it's kinda of getting annoying that he says stuff like that and then says you know I'm not telling you have to start doing that more. 
What do I do?