I'd recommend vet - and urgently. This happened to one of our ewes last year. She was two weeks off having twin ewe lambs (we had a PM done), got into the chicken area and ate a load of pellets. i phoned the out of hours vet (not our normal one) and they said she might scour a bit but be fine (!). She wasn't. I went to check on her at 4 am and she was panting and lying down but no sign of scour or discharge, 8 am I called the vet out. By this time she'd started internally haemorraging and was bleeding through her rectum. It was acidosis - the vet gave her an alkaline drench but it was too late, she died an hour later with me beside her, and her twin ewe lambs with her. Heartbreaking - she was my favourite ewe as well.
If you're trying to correct the imbalance I should keep well away from anything with acid in it - it was the excess wheat/grain that caused the acid imbalance in her which basically burned through her insides. We watched the PM and the rumen had clear lumps of grain in from the pellets.
Sorry to be depressing, but if the out of hours vet had been more clued up we could have got her an alkaline drench 12 hours earlier and we might have saved her and her lambs.