A 40 gallons tank is in no way appropriated for 1 or even 2 BP that size.
You need to separate them and put them in a 15 quarts tub each, the female IS dominating the male, which explain why the male is not eating. A dominated stressed BP will refuse to eat so will an un-healthy BP.
The health problem is something that requires veterinary care, it is very possible that at this stage your BP will require anti-biotic.
I understand you might have financial problems however you can always ask for a payment plan.
Animal ownership is not cheap and if you cannot separate them, care for them appropriately, or afford vet care than you need to re-home both animals.
When animals become a financial burden and are suffering because of it, than it is up to YOU to do the right for both the animals and yourself and this includes re-homing the animals you cannot care for adequately.
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