Painless lymph nodes swollen

I've been feeling ill for about a month and a half now: extremely fatigued and have had painless swollen lymph nodes in numerous places (groin, neck, don't even know where else to check, etc.) . I took a blood test 6 weeks ago and the only irregularity the doc found was an underactive thyroid, and wanted me back in 6-8 weeks for another blood test. However, very recently within the past couple of weeks I have noticed that the veins in my hands have become clearly visible throughout the palm area and even into the fingers (they have never been like this before). and also sometimes the skin on my palms and fingers where the veins are now visible are becoming mottled, that is, red and white blotchy patches (it's not from being hot or cold and it's not actually on the skin like a rash, more like under the skin from blood or something.). What could this possibly be? Lymphoma? A weird infection or virus of some sort? Any help or advice would be greatly appreciated. Thanks.