Rash On Legs, High BP, Allergy To Bactrim, Low Potassium Level, Reaction To Sun. What Is The Cause?

Question : Hi,
I have been on Senna since 2004, 40mg and without this I end up with bowel obstructions. Ok, having said that and knowing how it can affect long term use of laxatives and low potassium in combination, I still have to take it. My question is related to my Dyazide in 1996/1997, low dose once daily. Late last year, 2011 my blood pressure began to climb from 120/80 to 139/90, I had gained about 15 pounds also. I have an allergy to sulfa (Bactrim to be specific) but I am aware that the Dyazide is a different kind of sulfanomide and unless a rash or other allergic symptoms show, then one should be fine. In late 2011, my pcp increased my dyazide to two pills a day, the maximum dose and I cannot tell it has affected my bp, however, my blood work came back showing my potassium level low at 3.2 (first time ever) and my pcp that sees me every three months has not chose to act upon it, but I have started eating a banana daily until I return in March 2012. I also have a severe reaction to the sun, and I will break out in a petichea (sp) rash that is severe on my lower legs and top of feet, what is the cause of this in your opinion? I am on Xanax .25 three times a day for PTSD since 1992 with no change in dosage since 1992. I have had steroids on and off in the past few years due to back pain and atopic dermatitis and I have menieres in the right ear and take meclazine on occasions. I really want to stop the blood pressure medication and change to a more older appropriate medication for control. I have taken atenenol, but I became so tired I couldn't function hardly, it was a chore to get up and do what I needed to do. I have also had bouts of depression, but I refuse to take medication as I know it is related to seasonal and inactivity. What would be a recommended course of action to decrease the dyazide and/or replace it with a less potassium related medication, and what older bp medication would be a place to start and/or combination? I become very anxious about my medical issues. I have cholesterol at 235 and cannot take medications as they affect my liver, my tryglycerides are a bit high, not too bad, and my HDL is at 43 my LDL is 160, and I am 54y female with a complete hysterectomy and no estrogen supplements. My A1C completed every 6 months and I am not a diabetic ranges between 5.1 and 5.6. I am approximately for height and weight 25 pounds over the limit and my BMI is at 30 which supposedly puts me in the obese range. I weigh 162 at 5'2". Ok, this is a lot of information and this is my money, so I need a really good answer, please!!