i have bad teeth about 3 major cracks. feel no pain. no swelling. Bad anxiety. And these headaches i hope aren't caused from teeth.?

Who knows

Head-teeth
If you have no pain or swelling from your cracked teeth, most likely your headaches are not caused by them either. I am not sure what's causing your headaches based on the amount of info provided in your question, but I strongly suggest you have your cracked teeth fixed before they do become infected and indeed cause headaches and more so.
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answered:

Need complete exam

Cracked teeth in a patient with otherwise healthy mouth could be a sign of occlusal instability. Go see a dentist who is trained in this area to examine and diagnose. Look up Pankey institute great place to locate a dentist
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Yes- are related

Head-teeth
Cracked teeth can come from clenching or from dental work wearing out. Anxiety often causes more teeth clenching which is very hard on your teeth and jaw joints. If your bite changes slightly from the cracks in your teeth-this can produce substantial headaches. See a TMJ dentist for your headaches and to help get the right type of mouthguard to help lessen your clenching. Fix your cracked teeth.
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