may be sinus allergis your frequent off and cold may led to chronic sinusitis keading to pnd causing you problems the skin might be involved as next system leading to skin allergies get xray pns done and get treated in guidelines of allergic siuses controllingallergy will cure skin allerg also mean time take doxycycline 100 mg bd for 3 wk tak antillergic fexofenadine 120 mg od for 3 wk syp piriton 1 tsf night apply eomycin h eye ointment in nose bd sea water 2 drops at night each nose flunarazine 5 mg night to decrease headaches apply clindamycin gel over effected skin parts contiue 3 wk till you get diagnosis