Vacuum daily, damp cloth wipe of all surfaces daily, blinds wipe weekly with damp cloth. New pillow if possible, new bed if possible. Bed and mattress hold large amounts of allergens. High likelihood you are allergic to dust mite, they are microscopic and everyone has them. If you have a cat, you are allergic to it ... if you aren't going to get rid of it, it absolutely must stay out of your bedroom. There are studies proving improvement if you can get relief at least at night.

You might improve your quality of life a lot with allergy shots. (If you cannot get new mattress or pillow, plastic encasement can help, then you have to damp wipe the plastic daily).

A hepa air filter machine in the bedroom might help. It won't solve the whole problem if other measures aren't also in place, like frequently damp dusting and removal of cat/dog of present.

Your doctor may be able to offer temporary help with cortisone injections, but not everyone can have this, and you cannot have it repeatedly, so it's only a temporary solution at best.