Hello, Welcome to Healthcare Magic. In history you mentioned that, you had already evaluated by cardiologist and tests are fine, then we should suspect anxiety or stress for cause of current symptoms. Anxiety disorders can manifest not only with psychological symptoms but with a variety of physical symptoms also like: Tingling, numbness, hot and cold sensations, palpitation, chest heaviness, choking sensation, tremors (shakiness), diziness leading to poor balance etc. For long term control of anxiety following measures are helpful: relaxation exercise, medicines like SSRIs and non drug treatment like CBT. It is better to get evaluated by psychiatrist and start treatment accordingly. Wish you good health and all the best. In future if you wish to ask query directly from me, you can use the following link: http://bit.ly/Dr-Ashish-Mittal