Well I'm a level 44 Nord Warrior..100 skill in the following stats:
Heavy Armor
Smithing
Two-Handed

Like a 90 in One Handed and a 90 in Block and like a 57 in Archery.

I've pretty much just..ceased to level. I've been level 44 for what seems like literally a week solid. And I do things every day, dungeon dwell, loot runs, etc. But I'm just not leveling up anymore? Or if I am, it's going REALLY slow? I mean literally it seems like I've been 44 for a week.

What do I need to do? I mean I'm leveling up Archery but it seems like, even with the Warrior stone, it's going REALLY slow. Tips?

How in the world are you guys getting to 50, and let alone 81? I just don't see how it's possible. I play 4+ hours a day and I have not leveled up in 4 days at least.

Switch to light armor, use stealth, craft potions, smith gear and enchant said smithed gear. Use a one handed sword for close encounters with a spell in the other hand.

Work on every skill, use magic, enchanting, etc

What stone do you recommend I take to level faster? The Rogue or the one that levels them ALl like 15% faster or something?

You need to change your playstyle to different skills once you reach a certain point.

Equip a shield and a healing spell and go poke a mammoth

leveling more skills can help if some skill grow fast than other then they will hault leveling switch between other skills and try to keep a kind of balance between them (e.i keep your skills around simlar level)

sneak, smithing, enchanting and illusion are pretty easy skills to get up fast and remember to uses skills trainers for your main skills

I use the Lover stone that levels all skills 15% right now but I'll switch to the Mage stone when I start magic training.

Higher Level doesn't make the game more fun. You are just higher level. I would suggest not paying attention to the level guage and play how you want to play.

Plus once you hit level 50, then you will really complain about not leveling.