22 month crash?

Had a rough weekend, and wanted to vent a little. It started Friday, I was walking to keep active and had a dizzy/vertigo spell and had to sit down. Felt dizzy and groggy the whole weekend. Checked my blood pressure, and it was low on Saturday, 96/66, then above average on Sunday. Was sitting in church yesterday and had one of the "panic attacks" that I had been having since Mirena was in and up until I got preggers (hadn't had one during my pregnancy up til now, I'm 8 mos along). My vision went funny, then my heart started racing really fast, like I had a shot of adrenaline. It went away after a few minutes because I am used to them by now and know that if I freak out it makes it last longer. Talked to the OB on call and she didn't seem to think it was anything unusual (never happened with my other 2 daughters though). Typical. Now I'm scared to drive to work! Thankfully my work is flexible and I am allowed to work from home as needed, but I hope the next 2 months aren't like this. I'm starting to wonder if my body will be able to make it thru the next 2 months and the labor/delivery part. I hate feeling so fragile. I'm frustrated because I thought this was behind me. Stupid mirena.