Last week i wasn't feeling myself (very breathless and extremely tired - sleeping normal hours of the night but also about 4 hours during the day). I went to the doctors and they sent me for blood tests (due to get results back on tuesday.) I will have been off work for a week but i don't feel my normal self and unsure about going back to work. Im not sure if i should go to the doctors tomorrow and try and get signed off for a a few more days (need to produce a sickness certificate afer 5 days off work). There is nothing physically wrong with me just very tired. Im not sure if this is a good enough excse to bother the doctor again? Any thoughts?