Looking for advice

i have been unhealthy for awhile now with no answers. I had an ultrasound done of lymph nodes in my next a few weeks ago and the results showed enlarged, dense nodes. The doctor wanted a CT with contrast but because of stage 3 renal disease my nephrologist will not sign off on the CT. Now my doc wants me to wait 6 months and repeat the ultrasound. My issue with this is, i have severe stomach issues and have a hard time eating without pain, I've been having what I thought were nightsweats  due to low estrogen. My booodwork shows my hormone levels are fine. I had a hysterectomy at 21, I am now 36. I have severe shoulder pain, I'm always tired And lately I've been short of breath. I was a powelifter but I continued to lose strength on my regular routine and now am to the point I haven't even been able to work Out.

im just worried about waiting 6 months. Anyone have any input? I feel like my doctors think Im crazy.

thanks!