First of all the cause need to be ruled out.
You are already anaemic.
Start homeopathic Iron tonics and also immunity booster tonics.
Alongwith that take vit c diet like citrus fruits,broccoli,spinach which increases absorption.
Anaemia invites lots of infections.
Next Steps
you should first concentrate on increasing haemoglobin level.as u have aplastic anaemia and blood transfusion too creates several immune related problems.
Health Tips
for temporary relief start home made remedies like rub honey on gums,for nosebleed apply ice packs.
clove