C182 Pilot reported a loss of aircraft directional and altitude control during IMC conditions after an autopilot pitch trim malfunction. With ATC assistance the flight landed safely.

Narrative

I'm using a KN-140 auto-pilot; it was not holding course in the 'Heading' Mode. At the same time; in an attempt to use the altitude function for the climb out; I wanted to reduce the climb rate and I must have pushed the wrong button or a button too often; which caused the pitch-trim to move to a dangerous position. My attempt to correct caused the pitch-trim to disconnect in a dangerous configuration. In IMC conditions; I was unable to keep control of the aircraft; which caused spatial disorientation and my inability to gain control of the plane. In a steep decent I was able to regain control and Approach was able to assist us in landing at ZZZ airport. I explained this incident with ground control; along with an individual at TRACON following the incident.I will be taking recurrent and proficiency training from my flight instructor on instrument flying the plane. Achieving the proficiency necessary.It should be noted that I did not recognize the weather conditions having deteriorated as they had. The freezing level was approximately 10;000 ft. and the Tops were much higher than reported. (i.e. 15;000 ft. +) We did begin to have a slight development of ice; (like high frost) on the leading edge of the wing.