Feedburner issues are driving me nuts

I recently moved to WordPress a few weeks ago and my feed has been doing fine, no issues. For the last week it’s been slow to nonexistent on updating the feed and i’ve been having major issues with it posting to my Facebook page.

Today and the other day Feedburner was giving me problems again with not updating at all. I set the feed total to 5 and that helped but now my emails are of course only showing 5 posts and my readers are missing out on a lot of updates. How do I set it to 20 or so and have the feed run properly? I even tried installing FD Feedburner Plugin hoping that would work but it’s not different.

my feed URL for feedburner https://feeds.feedburner.com/ThriftyWifey

This is the error I keep getting in the feed medic :

Error getting URL: 502 – Read for https://thriftywifey.com/feed timed out after 60 seconds

There is an issue that must be addressed with your source feed for the feed “Thrifty Wifey Daily Updates”

Your feed filesize is larger than 512K. You need to reduce its size in order for FeedBurner to process it. Tips for controlling feed file size with Blogger can be found in Tech Tips on FeedBurner Forums, our support site.

I have pinged, validated, resynced, everything and none of it changes. I don’t want to only show 5 posts in the RSS and email updates, i want to show more than that.