Severe dizziness

I'm so sorry this will be wordy but I've tried to get help from my doctors for over a year now with no luck. I have severe COPD, moderately high blood pressure, AFIB with RVR, high cholesterol, diabetes and a subclavian artery blockage. According to a neurologist, the blockage has caused subclavian steal syndrome which contributes to the dizziness. Vascular surgeon doesn't want to do a stent because the blockage is close to another artery and nicking it would cause bleeding, meaning surgery which he thinks is too risky. I've only fallen once which was enough to keep me at home most of the time. It's not vertigo. I can feel it happening. I start to get a headache and light headed. The headache increases and so does the dizziness. My house is small so I can hug the wall or something till it passes. Sometimes, it makes me lean and I can't straighten up until it passes. That's when I feel like I'm going to fall. When it's happened at the doctors' offices, they've checked my blood pressure. Sometimes its gone done, sometimes it hasn't. Some days it doesn't happen, some days it happens alot. I don't even know who to go see about it. I feel like I've exhausted all the specialists. If anyone has any ideas, I would appreciate hearing them. Thank you.