Could Octreotide Be Causing My Worsening Tachycardia, Weakness, And Intolerance To Standing?

I start getting tachycardia sometimes while driving, or at a store where my heart rate just shoots up to 130- 140 bpm and i start feeling extremely weak and i have to get out of the store. Before trying octreotide i was fine i was able to go to the stores easily without a problem but now i cant. I have noticed cold weather helps me since as soon as i go out into the cold the tachycardia goes down I m guessing its from the vessels getting constricted for that period of time. I have even had times when taking a warm shower caused me tachycardia and i would switch to cold and it would calm down. I am having trouble standing straight now, I feel even more weaker especially in my legs. I have tried compression stockings as well they didn t help. I have also increased my fluid and salt intake but that hasn t helped me either. All test have been normal, Ct scan abdomen and pelvis showed a small sub centimeter mesenteric lymph nodes present. The Medication Midodrine- helps sometimes but Octreotide has made it worse! What do you think?