Hi, I’m surprised your GP didn’t sent you to an ENT specialist, if your doctor thinks it’s a blood cancer they are usually the first port of call, he would check your throat with a small camera, he would then decide if an ultrasound with biopsy was required. If the result was positive you would then be referred to a haematologist. Your doctor is probably thinking it could be lymphoma but the only way to detect this is with a biopsy. Maybe he wants to rule out a few things with the ultrasound. At least your doctor is doing something positive,  but I’m surprised he said about the blood cancer without results in front of him. I’m not a doctor but I’ve got lymphoma and this was the route my GP went down. My symptoms were night sweats, fatigue, lost a lot of weight and had some breathing problems, itchy skin.  Try not to worry, it’s a difficult time when a doctor tells you this, but it may be nothing. Fingers crossed for you, let us know how it goes.