Diziness, bodyache. Or just anxiety?

I have dizziness since last 2 months constantly and also had spells or headache and also had pain in knee and tendons in the back of knee and left shoulder joint which i used to think as brain tumor but the GP told me it's anxiety without any tests and gavee anti depressants. Now since last 3-4 days i have backpain (burning kind of pain) with dizziness amd constipation which i checked on internet which shows it as a symptom of blood cancer. The GP never found any swollen lymph node in head and chin area and also i never had fever or vomiting. Also i have 3-4 white painful small pimples in neck near my beard and eyebrows. My parents aren't worried about it and asking me to divert my mind to my studies rather than worrying. I visited another hospital where the neurosurgeon suggested me to visit the neuropsychiatrist for one session without any tests. Can it be something serious or just anxiety? Kindly help me out i m vry much worried n stressed n unable to focus on my mains preparation.