A Problem With My Mum? Urgent!?

Well you appear to be in a vicious circle. If you phobia is as bad as it seems, the ONLY course of action IS to get over the fear. Put it this way, your mum thinks of her fish as you do of your budgie. Problem? Yes. So get used to fish, as they CAN NOT HURT YOU! Spiders and Snakes can. So apart from killing the fish (DO NOT DO THAT!!!!) You have to get used to the fear. Thats that.