Citalopram for anxiety ?

i was started on citalopram for stress and anxiety two months ago and since then i have had symptoms of head pain and pressure as if i have a tight band round my head and pain at the back of my skull and my scalp feels sensitive and tingling.i feel very tight in my neck and across my shoulders and the sides of my neck feel swollen like swollen lymph nodes.ive had a bit of a sore throat and a fullness in my head and as if my ears are blocked and tingling in my left hand and fingers.these are the only symptoms ive had and have all started after i began the tablets! before hand i was very hyper and very anxious and now i am quite down like zombiefied! and i have all these symtoms.anyone any ideas whether all this is a reaction to the tablets and anxiety related? or could it mean something else serious? i too am convinced that i have serious medical conditions or a brain tumour and im very worried.if anyone could give any suggestions? thanks