Hello, I have the same problems... the head pressure... i found out that it is cause by anxeity..because when i start to get nervous i start moving my jaws back and forth..not realizling it and it causes the head pressure...which used to freak me out alot and almost lead me to a pannic attack but now i notice when i do it and try to stop myself then its okay...and the stabbing pains i got those alot too which are also cause by anxeity..my dr. told me that a person with anxiety problems is more likely to notice the little pains that we normally would not notice...i dwelled and dwelled on them for the longest time until he told me that and now its not that bad...the head pressure is the worst though....i take xanax for panic attacks and it seems to work fine...i've tried all different kinds of anti-depressants and none of them seem to ever work they either end up making me sick or making my panic attacks worse...but anyways hope this helps and hope your anxeity gets better!