I am 50 years old have tachycardia, but lately all I want to do is sleep. I injured my back in 2000. Get headaches alot, can go 2 to 3 days not eating. Get dizzy standing up. am on Cymbalta 60mg once a day,Metoprolol ER 100mg once a day,Lisinopril 10mg once a day, Morphine 30mg 1 every 8 hours, Methadone 10mg eight times a day. Also am 5 6 and weigh 232. I know over the winter I got lazy. Sometimes walking just wears me out and my heart beats out of my chest, yesterday my pulse was very high and I was just sitting.