Hi! Good evening. I am Dr Shareef answering your query. With all probablities, the lump is a inflammed lymph node due to the infected sore on your scalp/head. If I were your doctor, without interfering with your present treatment, after a clinical assessment would advise you regular would care of the scalp and in addition a broad spectrum antibiotic and an anti inflammatory with a proton pump inhibitor drug for a symptomatic relief and possibly a cure. For more sleepiness, I your possibly need a review of your medications by your psychiatrist. I hope this information would help you in discussing with your family physician/treating doctor in further management of your problem. Please do not hesitate to ask in case of any further doubts. Thanks for choosing health care magic to clear doubts on your health problems. I wish you an early recovery. Dr Shareef.