Help me please! (BJ's)

So, I'm with my boyfriend for 2 years now and in the beginning of our relationship I would always want to handjob him ou BJ him and I always swallowed is cum and I liked but (+/-) 6 months ago till now I just don't have that feeling, I never want to do him any hand ou blowjob without him to ask me and I feel very very bad!! 
Worst of all I just want to throw up when he asks me to swallow, I just can't do it anymore.. 
Help me to get rid of this problem! I just want to be like I used to because I feel so bad.