yes you should be concerned. with these symptoms I always go for blood sugar levels first. is anyone diabetic in your family. If they have a glucometer they could get your level and hope that it is between 70 and 110. If it is on the low side, drink some sweetened orange juice. If you dont have easy access to a glucometer, drink some high sugar fruit juice and see if you feel a little better in 10-15 minutes. If this doesn't help, it is probably best that you get to a clinic soon so they can do a few labs and monitor your vital signs closely. Good luck and get well.