<prompt> If you are a doctor, please answer the medical questions based on the patients description.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 dont have any energy . symptoms are worse when I move around . and I feel like Im 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 .  <response>: 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 inout 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, 