I am breastfeeding, tired and very stressed. i have intermittent facial tingling and once arm tingling. blood tests are normal. what could it be?

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Post-partum depression is not uncommon. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity at tolerated.