For the last 2 weeks i have felt like my heart is sitting in my throat. i have a 25 year histroy of mitral valve prolapse we well. ?

See a cardiologist: It may reflect worsening of valve disease.

Need follow up: Your symptom is not specific of anything. But, people mv prolapse do have a lot of atypical symptoms. Only thing anyone with mv prolapse is regular follow up with echocardiogram. As long you don't have a significant valve leak and heart failure symptoms you don't need to worry. If you have heart rhythm problems that can be treated as well.