If she is still alive, I would add antibiotics immediately. Preferably a intramuscular injection. If you do not have that available the oral route would be the next best bet and last would be bath.
Go to the elasmobranch husbandry manual
http://www.elasmobranchhusbandry.org/ - I think it is chapter 29 - in there is a pharmacopoeia. What ever antibiotic that you have at home, look up the dose and give it to the shark. I posted a video on this board on how to tube feed a shark. The same concept applies to giving medicine.
That said, there are other things that could cause the neuralgic symptoms your shark is exhibiting. A vitamin deficiency would be a concern and supplementation is worth trying. Viral illness, difficult to treat, is another concern.
With the bloated belly - I would first think bacterial.