Clamminess can be caused by many things, some relatively benign like being anxious (part of the flight-or-fight response) or stressed, or serious such as cardiovascular disease, shock, drug overdose, hypoglycemia (low blood sugar), pneumonia. Without more information it is impossible to say.
As for the breathing issue, are you out of breath or is it just a feeling without definite symptoms?
If the latter, it may be anxiety.
NOTE: I am not a doctor, and more importantly, I'm not your doctor so the above advice is necessarily of a general nature which may or may not apply to you. Always consult your health provider before acting on anything you've read here.
NOTICE: The information provided on this site is not a substitute for professional medical advice,
diagnosis, or treatment. Never delay or disregard seeking professional medical advice from your
physician or other qualified health provider because of something you have read on Wellsphere.
If you have a medical emergency, call your doctor or 911 immediately.