Hi Amber,
I thought you were on Lantus, you're describing some of the side-effects that many people suffer from.
Do some research on this forum, google, and please contact the IDDT (insulin dependent diabetes trust)
http://www.iddtinternational.org/ It might be linked, it might not, I'd definately get your lymph nodes checked out to rule anything else out.
A previous poster mentioned ME. Symptoms of ME / Fibromyalgia are almost identical to the side-effects of Lantus; including muscle & joint pain, foggy-head, poor memory and cognitive dysfunction. Fluid retention, anaemia and sleep disturbances are also reported. As are digestive problems,weight gain,unusual overwhelming tiredness, and a feeling of being poisoned. Not to mention unpredictable, erratic BG control.
If you can't find a pattern and have ruled out other causes, please consider changing to another basal insulin. It's worth a try if you're feeling so bad.
Are you on a large dose of Lantus? I've noticed on this forum that people on larger doses seem to suffer more.
Jus