If you take Red Yeast Rice, you are taking a statin. It would be safer to switch statins until you find one you tolerate.

Red Yeast rice contains monacolin K, which is structurally identical to lovastatin/Mevacor/Altocor/. Sideffects from Red Yeast Rice would be identical to Lovastatin.
And, since it is a supplement, it is not regulated by the FDA so you really don't know the dose. Consumer lab has tested the various brands of red yeast rice and the amount of the statin varies from brand to brand.
Since you tolerate Red Yeast Rice, it seems to me that you would tolerate Lovastatin.
Some of the same rules that apply to prescription statins, also apply to Red Yeast Rice.
You should not eat grapefruit or St Johns wart when taking Red Yeast Rice.