Hi lightshines, i too suffer with horrendous HA,i take 40 mg of citalopram a day to try and control it and stop me poking at myself or the DC's looking for lumps and bumps HA is an awful nasty thing.
Anyway, i think i can maybe make you feel a bit better. I was where you are 5 years ago and was still there till almost a year ago.
DS when he was 4 became very very ill, i noticed he had a gland the size of a golfball (yes really) in his neck under his jaw and kidney bean shaped/sized glands at the back of his neck in a cluster, i took him out of hours GP who said it was fine, not being convinced, i took him to my own doc a couple of days later.
Doc was very concerned, measured the gland, felt for more glands in his armpits/groin, felt his spleen etc, gave him Anti-biotics and wanted to see him again in a a week or so.
Gland did go down slightly but doc jept giving him anti biotics, diff types, glands still did not go.
After a while, he was referred to an ENT specialist who did not appear bothered by the glands, but more interested in his ears
Anyway, cut a long story short, i worried for YEARS, everytime he was ill in the sluightest i worried myself to the point where i thought i was going to have a mental breakdown.
It all came to a climax at the start of the summer holidays last year, he presented with severe tummy pain and was rushed to hospital with suspected acute appendicitus, of course they wanted to take blood and i told DH that we couldnt let them because i was so worried about them finding leukimea, of course they took it and i found out that his white blood count was a bit high, i spent a whole miserable night in the hospital just me and DS with me imagining all sorts of horrible things i cant even bring myself to type some of the dark thoughts i had.
Anyway next day, bloods where re-taken and they had dropped, i was so relieved because that was soooo reasurring... untill months later, when his feet kept swelling up and where so painful he couldnt walk, i googled (stupidly) and found that swollen feet and other body parts can be a sign of leukimea, i took him docs who took the wait and see approach, once DH and DS had left the room i told the doc about my fears, he said it was very unlikely, but as i am sure you are aware of 'very unlikely' is not reassuring enough
i told him he had very recently had blood tests so the doc checked and apparently his WBC was fine, it was the inflammination marker thatw as up, so i finally felt better, BUT the glands are still there,a s large as life to this day, so i suppose my long and rambling boring post is trying to make the point that glands do easily swell in children for whatever reason, amnd they dont just go away either, DS is now 10 and the glands are as big as they where 5 years ago
If you search the archives, you will find lots of Mnetters with the same problem with their children
Hope this has helped a fraction and i havent bored you to tears