Diane will certainly be able to advise you about ulcer meds as there are several different types, plus I think you can use some human ones, but not sure what is best for a foal of her tender age. I am thinking that perhaps the dark smelly poo is the combind result of the infection and the meds? The fact that it is soft and that she is not having to strain to pass it is good. I also think that it sounds as though she is getting enough 'food', but do do a quick skin and gum test, as suggested by Renee, to keep a close eye out for dehydration and/or any circulation problems.
Keep Jewel on her mushy feed and possibly pick her some grass while she is being kept 'contained' just as a precaution against colic, and when things are ok again and you are ready to let them both out, I would suggest keeping Jewel on a lead rope for a couple of days or so, letting her graze in hand as she may want to take off for a good run round after being stalled - not good for little Onyx as she will be lacking in energy and feeling a bit below par having had an infection. Just take it carefully for a few days.
Still sending prayers, look after yourself, you are doing a fabulous job under very difficult and stressful circumstnaces. Good luck!
Keep Jewel on her mushy feed and possibly pick her some grass while she is being kept 'contained' just as a precaution against colic, and when things are ok again and you are ready to let them both out, I would suggest keeping Jewel on a lead rope for a couple of days or so, letting her graze in hand as she may want to take off for a good run round after being stalled - not good for little Onyx as she will be lacking in energy and feeling a bit below par having had an infection. Just take it carefully for a few days.
Still sending prayers, look after yourself, you are doing a fabulous job under very difficult and stressful circumstnaces. Good luck!