Is he sick because he ate prawns again? Or is it a bug? If from the prawns give him phernergon (if he isn't allergic to it of course) it might help.
na not the prawns this time....

heres the update he has a bit of a fever yet feels alright to touch on back. he has bad lower back pain like contracting type pain coming and intensifying then going, his kidneys are very sensitive and he has finally kept down water down for 2 hours, runs stopped this morning so that's good but his legs feel very heavy and aching. he said his nausea feeling has subsided or the pains in back have intensified. He is moaning a bit but when asked whats the pain like he said 7 i gave him some panadol and held a heat pack on him for some time.

ive NEVER seen him like this before.