As long as you are able to keep your milk supply up with frequent, effective pumping, there is always hope.
Poops are always going to tell you more than pees do about if baby is getting enough. BUT, the issue is that at this age, many babies will normally move to a less frequent pooping pattern, some will even go several days without pooping at all, and this can be totally normal & not mean anything. That is why, if in doubt, I would suggest definitely look at wet diapers, because if you don't get enough of those that could indicate a serious issue, like dehydration. But to be sure baby is getting enough to gain, if baby is not pooping at least 3 times everyday, and especially if poops getting less frequent coincided with the strike, I would also think it may be helpful to have regular weight checks, maybe weekly or every two weeks, on the same scale. What you want to avoid is going into the doctor after a month of this and finding out baby has not gained or has lost weight. This might freak everyone out and you could be told to supplement.
I am not sure if reflux would prevent a baby from nursing, as breastmilk sooths the pain of reflux. Also a baby with reflux is usually unhappy and uncomfortable. But certainly you could discuss that with the baby's pediatrician.