### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
hi , I have had surgery on my foot 4th of feb , ever since I have been suffering from heart racing , dizziness , hot flushing , and just don`t have any energy . symptoms are worse when I move around . and I feel like I`m not getting enough oxygen . I felt like this after I had a knee replacements and had blood transfusions , which fixed the problem . do you think I could have that problem again ? thankyou .Lesley .

### output:

Hello! Thank you for asking on Chat Doctor! I understand your concern, and would like to explain that a careful differential diagnosis of different causes related to this symptomatology (such as low blood pressure, orthostatic hypotension, chronic anemia, an infection). Even anxiety could mimic this clinical scenario. I would like to know the type of surgery you have gone through. Was it a small intervention? Did you need blood transfusion during the intervention? Had you had any fever in the days after the intervention? I recommend consulting with your attending physician for a careful physical examination, a resting ECG and some blood lab tests:- complete blood count (anemia and infection)- PCR, sedimentation rate-kidney and liver function tests-thyroid hormone levels (thyroid gland function)- cortisol plasma levels (a Chat Doctor.  You should closely monitor your blood pressure in sitting and standing up position. A decrease more than 20 mm Hg on your systolic blood pressure while standing up, compared with sitting position, may indicate orthostatic hypotension. A head up tilt test is needed to rule in/out this possible diagnosis. If all the above tests result normal, the most probable cause of your symptoms would be anxiety. In such a case, you should consult with a specialist of the field. Hope to have been helpful! Best wishes, 