Stage 4 colon cancer mets to bladder lung. Developed multiple bilateral pulmonary embolisms and have been on fragmin (dalteparin). Am I to stay on fragmin (dalteparin) forever?

Colon ca and DVT. Yes, patient has and advanced stage of colon ca. Prevent DVT may be a very personal issue, otherwise is recommended.
TIme for discussion. It's time for you to have a frank talk with your health care team about your own wishes. No one can force you to take medication if you feel the trouble outweighs the benefits. There is no "correct" answer here -- only that you possess autonomy and a right to accept or refuse based on accurate information from trustworthy people. Best wishes. Be strong.