can not access /admin/settings/performance to clear cache

I have been installing a lot of modules on my site today, creating an events page and following the SEO checklist module recommendations. I started having some issues with links in admin disappearing or I would click on a link and instead of loading the requested page my current page would just reload. I started clearing my cache using /admin/settings/performance and that would fix the issue. I just installed the advanced help module and about 75% of the links disappeared from /admin, including /admin/settings/performance! Is there some way to clear the cache without being able to access the performance page? I have tried to access the page directly HTTP://www.mysite.com/admin/settings/performance with no luck. I did a search for this issue on these forums and could not find any help. If it is on the forum and I missed it I apologize in advance. Anyone have any ideas?