Blood pressure measurements symptoms and conditions

My experience with Lisinopril is similar to many others here. Mine is further complicated by the combination of drugs I am taking.
Due to my BPH I was taking Proscar and Doxazosin (4mg), the Doxazosin helping with hypertension as well (140/90). My doctor decided to add 5mg of Lisinopril to augment and help lower the blood pressure some more. He also liked the overall helpful aspects of the Lisinopril on the cardiological system. After about a week and a half on this regimine I was having dizzy spells and light headedness.....disconcerting when driving. I also had the infamous dry hacking cough noted my almost everyone. I stopped taking the Lisinopril and things went back to normal.
On my next visit to the doctor, he wanted me back on the Lisinopril but trying 2.5mg doses. That seemed to be OK for awhile. I have now added Flomax to my regimine and noticed the same dizziness problem. So I am staggering my pill taking which seems to be helping somewhat.
However, after three weeks on this program, I am having severe dry hacking cough episodes, 5-10 times per day. Also have to be careful when I stand up due to dizziness. Additionally, I am having sporadic insomnia problems that are out of the ordinary for me. Also, runny nose, sneezing and a tightening feeling in the chest and abdomen.....Almost like a mild flu. The tightening feeling is more like a caffeine overdose high...ergo the insomnia.
I attribute the hacking cough to the Lisinopril. The insomnia could be the same or possibly the Flomax. I'm not sure about the tightness. I plan to stop the Flomax next week when I go back to the Urologist and will stop the Lisopril at the same time and see what happens.
I would be interested in any input readers may have on my dilemma.