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He or she can put you in touch with the hospital's support staff. It is normal to feel depressed after a cancer diagnosis, especially if you were depressed beforehand. Hospitals have psychiatrists, social workers, support groups and other support mechanisms. The more progressive hospitals can also put you in touch with complementary medicine practitioners such as acupuncturists, massage therapists, etc.
The feeling of loneliness you describe is very common among cancer patients--it can be a terribly isolating disease. But you don't have to suffer alone. Reach out and get the help you need. Don't give up.