you seem to be having infection because of which you have fever and other symptoms, during infection it is possible for the nose to bleed sometime,or it can be due to sneezing
very hard also.you need not worry if its happened only once or twice during infection with cold and fever.if it persist and your nose is bleeding even after you infection has subsided then please go to ent specialist
and get yourself checked.
for the itching on your body it can be related to allergy
. if you have family members with asthma
or allergy then its mostly due to allergy only. you should visit dermatologist
,he will help your skin problem, with right approach it can easily be controlled.