Gary Coleman is banging his head against a wall over his unhappy marriage – literally!

Coleman, 40 – the former child star of “Diff’rent Strokes” – has “anger issues” that threaten to destroy his marriage to Shannon Price, 22 – a fiery redhead he wed last August.

With their marriage on the rocks, the two are seeking help in a TV courtroom – “Divorce Court” – in a special two-part hearing before Judge Lynn Toler (Part Two airs today at 10 a.m. on WWOR/Ch. 9).

“If he doesn’t get his way, he throws a temper tantrum like a 5-year-old does,” Price testified in yesterday’s show. “And he stomps the floor . . . and he starts throwing stuff around and he bashes his head in the wall, too!”

Coleman did not refute her testimony, nor did he ask, “Whatchu talkin’ ’bout, Shannon?”