You have set out your concerns about your son very well. I agree with you that it is avery bad idea to have a cat at school as cats often cause allergies in allergic children and may certainly aggravate asthma. Please ask the teacher to remove the cat from the school. Your son is on excellent medicines for his asthma yet he is not doing well and is having problems with asthma at night. Is he using a spacer with the Seretide pump? He must use an effective spacer such as an Aerochamber spacer that has a blue colour.
Swimming is indeed very good for children with asthma and your son should be encouraged to swim regularly. It will help him to learn how to control his breathing and will also help to develop the muscles of his chest.
If your son continues to have such troublesome symptoms of asthma he should be seen by a paediatric allergist so that he can be properly tested and placed on the best treatment for his asthma.
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