Hello and welcome to eHealth Forum!
The symptoms (confused/can't focus and my short term memory is really bad) can hardly be due to brain tumor, your primary concern. Short term memory loss, confused, canât focus etc. can be triggered by sleep disorders. There is a possibility that you have a sleep problem and nothing more serious. Please consult a sleep specialist to start with.
Certain types of epilepsies and seizures too cause short term memory loss along with tiredness or fatigue. Chronic infections too are known to precipitate memory loss. Disorders of the hypothalamus, chronic fatigue syndrome and
psychiatric disorders like depression too cause similar symptoms.
The enumerated the possibilities should be ruled out one by one. A confirmed diagnosis cannot be given on net.
Regarding varicose veins you would need to consult another vascular specialist if this one is not helpful. Doppler studies and angiograms are often required along with clot removal or sclerosing therapy.
Hope this helps. Take care!