How Can I Overcome The Depression And Taking Lisinopril For BP And Had Concussion And Damage Of Rotary Cuff?

I AM 83 years old weigh 70kgs, lately I have been feeling very 'low', empty and fatigued. I take lisinopril blood pressure medication, aspirin, citalopram hydro bromide, also Metoprolol. (I had three stents fitted to arteries in May 2008) My right shoulder rotator cuff was damaged in a mountain accident 2 years ago, when I also suffered concussion. I have a very loving and caring family, and my relationship is very secure. I have no energy but manage half an hour walking in the local pool probably 3 times a week, which is all I can cope with at present. I like company and sleep well, having to get up to the toilet usually 2/3 times some nights. Any suggestions would be very welcome to help me overcome this depression. Maurice Perry.