If your symptoms appeared after the TIA, then Glenntaj has some valid points. If you had the symptoms before the TIA, then I think you need to have an autoimmune work up.

You could start with your GP or Neuro (if they are willing to investigate) OR go to a rheumatologist. You need some basic AI labs, (ANA, ANCA, RF, SSA & SSB, Lupus anticoagulant, C3 & C4, autoimmune profile, cryoglobulin, IgG subclasses)...just to start. There are more, but can't think of them off the top of my head. If you ask for an autoimmune (full) work up, they will know.

Tell me more about the heart disease. How was this diagnosed? Are you taking anything for it? What are your symptoms? And do you have problems with your BP when standing?

If you have a clotting issue, it can affect the heart issue. So I think the focus should be on 'what' caused that TIA/stroke. So you should get the aCL blood test done for sure...along with the lupus anticoagulant, protein C & protein S, PTT, and various other clotting factors. Has the temp vision loss, facial paralysis, etc happened more then that once? If so, how many times? This TIA/stroke cannot be ignored...so I'm glad you're taking the aspirin. Has it occurred again since you started the aspirin?

Once you get some basic labs done, then hopefully the results will give a direction to follow. This is not necessarily a fast process and takes some patience.