This sounds like you really really need to sit down and talk with your doctor.
S/he is going to be the best person to assess your needs.
However migraines shouldn't be cause by a lack of hormones (too many hormones yes but not lack of).
The wek bladder suggests 2 things either (most common) muscle weakness which can be remedied by doing kegal exercise properly - this can be taught by a physio at your local hospital - note that kegals are worthless unless done correctly.
Or possible bladder prolapse which may or may not require surgury.
Some bladder prolapses can be helped by wearing a prosthesis some severe bladder prolapses require a bladder sling.

Get an appt with your doc/gyn as soon as you can to get these matters checked out and talk to them about your worries with hrt due to your previous thrombosis.
Also remember many years ago plenty of women survived without hrt - do you really need it?