A 6 week cold

Is it normal to have a cold that lasts for 6 weeks?! This has been the worse cold I have ever had. I don't have the best of immune systems despite eating well and exercising regularly. Normally I get one and it lasts for about 3 days max and its gone. This is like a cold on steroids!

I've been taking over the counter medicines constantly all this time. All sorts of home remedies and nothing is working. I'm forcing myself to get out of bed and help around the house. I haven't been outside in 5 days. I have to go back to work on Monday and I have one more night to get better. I can't sleep at night because I'm coughing so badly.

Tell me your home remedies please. Hoping there's something I haven't tried yet.