No fever, weight loss, night sweats since 1/14, all but one was mild to moderate neck area. one true night sweat, after increasing synthroid, (thyroxine) have anxiety, normal cbc, ct abd+chest, lymphoma chance?

Probably not: Within normal CBC and negative CT scans, lymphoma is fairly unlikely. However, there is a long list of other conditions that can cause night sweats including anxiety,over treatment of hypothyroidism, infections, and many medications including pain medication and antidepressants which can affect your thermoregulatory center. If not medication induced & continues, see your doctor for further tests.