LM,
Howdy ! Sorry to hear of your continued worries. Many people suffer from the same symptoms you are describing, flutters in your throat, which are known as palpitations. Wondering if you Dr. did any lab work I.E. potassium, thyroid etc. ?
Dizziness can be caused by many things. Have you had your blood pressure checked recently ? I get lightheaded now and then but I suspect it is from the meds I'm on. Blood pressure fluctuates throughout the day and it may be causing it. Also, make sure you are drinking plenty of fluids and not going without eating.
When I am feeling very anxious I will feel dizzy and a bit disoriented if I am out in public but that is usually due to anxiety and my trying to find where the heck I parked my car in the mega parking lot.
Always check back in with your Dr. if you continue to have problems.
Kindly,
Kitt