4 year old destroying us. We feel so helpless

Our 4 year old is literally destroying us. My wife and I feel we are on the verge of separation. We had a great marriage before our daughter was born. In fact, the first year or two was pretty great, considering how bringing in a child into this world can be very stressful. Our marriage at the time was strong.Then our daughter turned 2.5 years old. She slowly started getting night terrors, nearly every night, that would last between 30 minutes and an hour. Her daytime meltdowns were bad but seemed to improve over the years. But, she's nearly 4.5 years old, and my wife and I are severly sleep deprived. Each and every night our daughter wakes up from night terrors. These last for 30 minutes on average and come around about two hours after she goes to sleep. We have tried naps in the day and tried keeping her awake during the day, but it made no difference.Then we have the daytime meltdowns. Which are another thing completely. These can last for an hour or more, several times per day. We thought maybe she was dealing with stress at the sitters, so we moved her to another sitters but there was no change. I will be taking Monday off to look for a child psychologist, as recommended by our pediatrician.We feel so helpless. Our daughter single handedly destroyed our marriage and is slowly dissecting us both apart with sleep deprivation. We are so lost and don't know where to go from here. A child psychologist is our last hope. That being said, is there anything we should know about finding one?I apologise if I am all over the place. Last night was the fourth night in a row of getting 4 broken hours of sleep.Any advice is greatly appreciated. via /r/Parenting https://ift.tt/2Lbwepu