Hi, Left sided chest pain can be due to various reasons.It can be muscle strain related to muscles of the chest and neck. Sometimes abnormal posture during sleeping or working, it can cause pain. It can definitely be related to gastritis or reflux disease which gets precipitated with oily, spicy food, lack of water or increased tea and coffee. Other reasons can be cervical disc disease, heart related problems, anemia or vitamin deficiency. Even stress can be one of the causes of all these symptoms. All these can also cause dizziness and vertigo. I feel first of all focus on your diet- take good balanced diet with lots of fruits and vegetables and plenty of water.Have a good night sleep 7-8 hours at least. Maintain a proper posture especially while working and sleeping. If still the symptoms do not get relieved then do some investigations like complete blood count, vitamin D, blood sugar, electrolytes (sodium, potassium) ECG and X-ray neck. This will help to make a proper diagnosis. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Milinda Gupta, Internal Medicine Specialist