try unblocking the first 3 temporarily. firewall is basically your main security, it could be blocking some stuff. dos blocking might be glitchy and think loading a website is putting too much stress on the internet and an attempted dos attack. block pings just sounds like it could be causing it. i wouldnt recommend having your firewall off for too long though, just test it for a few mins and see if it gets better. your internet is vulnerable without a firewall.
im not really sure about the last 4 options but i'd just mess with all the options and see if it makes your connection better. if you fuck something up hopefully theres a reset button/pin hole on your router you can hold for 20 seconds or something to reset to default. dont...