I pass heart attach 6 mo ago, since than i am trying to do jogging
everyday, but Im afraid that i push too much, so i am looking for a
device, which i can easily carry with me during the jogging, that will
monitor my ECG and alert me if there is a new ischemia in my heart,
where can i buy such a device? Thanks a lot!

I think the short answer to your question is, "no, there is no such
device."  A simple search for "portable electrocardiogram" indicates
that there are some portable units in development for use in
ambulences and such, but certainly not a device that could be carried
and worn during jogging.  Perhaps you should speak with your doctor
and discuss what excercize would be appropriate and safe for your
particular condition.  Good luck!

Google search "portable electrocardiogram"
://www.google.com/search?hl=en&q=portable+electrocardiogram&btnG=Google+Search

Congratulations on making a serious effort to improve your health
after your heart attack. The following information is not intended to
substitute for advice from a physician or other medical expert. You
should talk to your doctor about your exercise routine and medication.

Many people who have had a heart attack benefit from ACE inhibitors,
Beta blockers, statins, vasodilators, anticoagulants, and aspirin to
name just a few medications. Use of these may make exercising easier
on your heart.

If jogging is too strenuous at the moment, walking several times a day
may be better, or bicycling, rowing, cross-country skiing, etc, either
using machines or actually doing these activities. There is a
hypothesis being tested that shorter periods of exercise several times
per day may be superior to one long period, e.g., three 20-minute
periods instead of a one-hour period.

Chest pain, or angina pectoris, is likely to tell you that you are
developing ischemia. Always carry nitroglycerine tablets with you when
exercising (if prescribed). Wearing a transdermal nitroglycerine patch
may prove helpful as well.

Depending on your age, the extent of the heart muscle damage, and the
method of treatment, you may be able to reverse at least some of the
damage done by the heart attack.

If you are having chest pain while exercising you should consult with
your doctor immediately!