Low sex drive help? :(

My boyfriend & I are in a LDR and we've been together about 3 years. We haven't seen each other in 6 months, and now that we're physically together for a little bit, I have almost no sex drive whatsoever. I'm not interested in giving him bj's either. I feel so bad cause obvi it's been a long ass time...and I don't know what's wrong with me! Luckily he's incredibly nice about it and never pressures me or makes me do anything I don't want to. But I can tell he's a liiiittle frustrated, and I am too! I want to have more sex but I just can't.