Hi.
If you are getting scared with such attacks of lightheadedness- now often, cold hands and gritty feeling in the eyes, the probable problem can be related to the stress and the
anxiety.
You also get an uncomfortable feeling in the chest and stomach, again related to the Psychological problem unless proved otherwise by appropriate examination, investigations and proper treatment.
I would recommend the following for you.
Get a Doctor's opinion, physical examination of vitals to see that you do not have
Hypertension, Blood reports to see that you do not have
Thyrotoxicosis and other medical problems, CT scan brain for
headaches and other tests as may be advised by your Doctor.
If all the tests are negative, I would recommend you to have a
Psychological evaluation and Psychiatrist's opinion and treatment and further treatment.