Basic problem is the regulation control in the conditioner that moderates air flow and compression has probably failed. The alternative is the air flow is somehow being blocked.
If the latter, check filters and access to the unit.
If the former, your will need to replace the regulator control. It is time to call in and get an estimate for that. Not being an air conditioner specialist but knowing there is a wide range of equipment, both in size, age, and quality, you must call one in. The alternative is to replace the entire unit.
Cost of repair and replace varies, but you will pay $200 to $700 which ever route you take.