Just to boil this down:
1) Your symptoms sound like anxiety (if you'd told the app "doc" the whole story about your HA, he may have given you different advice).
2) Yes, people on bed rest should do as Smitten said and find small ways to keep moving. There are also leg sleeves they use to keep blood flowing in extreme cases.
3) You mentioned you had the "dizzy, floaty" feeling before you assigned yourself bed rest, so it's clearly not from a blood clot. It may be from allergies, hormone issues or just plain anxiety. But if it's keeping you from living your life,
4) Get out of bed and ask your GP or OBGYN about it!