Can a heating pad help shrink a 7.5 cm ovarian cyst? Any other remedies to naturally shrink an ovarian cyst? Also, can it shrink much within one week?

No. A heating pad can help with the discomfort from an ovarian cyst but will not help shrink it. They can shrink some or rupture and go away completely in 1 week, can remain unchanged or can even grow in that time. That is the reason that follow-up is recommended. Hope this helps.