The best way to stay alive is to crouch down, but do not lay down. Find good cover, and any chance you have, get a machine gun or a semi machine gun. When you are crouched down, remain that way. It makes you a smaller target and it does not affect how fast you run. Also, the health packs are not very rare, but you still have to look for them. If there is a room that you do not have to go into, you may as well look in it regardless.
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