What Causes Elevated Blood Pressure Level Upon Smoking Marijuana?

big question: I have been diagnosed with depression, OCD, andxiety, Panic Disorder, Binge eating disorder, and possibly Bipolar disorder... I ocassionally smoke marijuana for anxiety relief, I have been on several anti depressants in the past but am not currently on anything. I am by no means a drug addict but have experimented with cough medicine (DXM), and shrooms on two ocassions... This past week I dosed DXM in large quantities twice daily six out of 7 days (nearly all waking hours I was very high on DXM) until Sunday night I felt I was dying because I was experiencing what felt like a 8 hour deja vu episode (I had experienced a similar episode the day before) so I went to the E.R. where I had high blood pressure and was kept for only 4 hours and released... Well It s tuesday night now and, still as I write this I feel I am in an endless deja vu cycle,.. I am also convinced that there is something very wrong with my brain and that my death is imminent. I have done my due research but need expert opinions. I think possibly temporal lobe epilepsy, a brain tumor, or maybe brain lesions (I;ve heard of heavy DXM use causing lesions), or perhaps there was an already serious underlying problem that the drugs flared up? I have never used DXM more than one day and one dose a day before last week... Also, ever since I first tried marijuana a year ago I have experienced a lot of minor deja vu episodes when I was high... I m sorry for the long winded question/freak out but I am panicking to a degree and am seriously concerned about my well being. Please help.