Family asking me to wean 9 week old?

[Lisa C]

I breastfeed and also pump. At my six week appt. I found out that I have a cervical infection and I was placed on an antibiotic and tylenol with codeine. The tylenol is saving my life but sedating my baby and so I just haven't been taking it.
Lately, my husband and mother have been pressuring me to wean my 9 week old since I need to take the meds to get better, as well as other reasons like : "You're going back to work and you don't have enough pumped; we need to be able to have him take formula if there isn't any breast milk and he hates it" Which is true, my child hates formula with a passion.
And from my husband: "It takes up too much time with the pumping and storing and feeding on demand. I want to go out and do things with you again longer than three hours. I miss you so much."
But I want to do whats best for my child. I see both sides to this and I am torn. Some days I think it would be nice and others I feel guilty for thinking that way. Any suggestions??