If I have experienced side effects after increasing the dose of Depralin, should I go back to a lower dose?

The doctor prescribed me Depralin 10mg after a history with me. For the first week he told me to take after 5mg per day and from yesterday according to his recommendation biore after the whole 10mg. And since then my well-being has deteriorated, I could not fall asleep I had cold apnea after falling asleep.today I also have severe abdominal pain intensified fears, but this is ok. Biore drug 9 you day including the second at the prescribed dose of 10mg. My question is whether I should return to the dose of 5 mg.if the changes occurred after taking 10mg