Stage 1 Grade 1 Adenocarcinoma

Follow-up care probably depends on your doctor and your cancer. Standard is usually every 4 months the first 2-3 years, then every 6 months till your 5th year and annually after that. Visits include pelvic exams and questions about how you've been feeling. I think other testing depends on the type and stage of cancer you had as well as your doctor's beliefs and practices. Some are more conservative about testing than others because of cost, risks of radiation exposure, and iffy reliablity of a test like an CA 125.

I've been a houseplant since March because of Covid, too, but I do go out for groceries and medical and testing appointments. Do follow your doctor's advice for a colonoscopy since you have Lynch and these symptoms. He's right to have you rule that out first for your complaints about weight loss and fatigue. While you are waiting for your appointment, I'd also get to your primary about this to rule out other possibilities as those also exist for such symptoms. He can order lab work and xrays to help get to the bottom of what's going on. 

If those two courses of action yield nothing and you continue to lose weight when you're not trying to, by all means go back to your oncologist or get a 2nd opinion and push to rule out that you are not having a recurrence. Any doctor probably needs for you to take those other actions before they'd be able to justify to insurance sending you for any of the more expensive testing.

Your concerns are not in your head and you do need to get them checked out; don't let Covid hold you back because you do have to take care of your health needs while protecting yourself from exposure. 

I can answer your question about follow up visits.  I have serous intraepithelial carcinoma.  No malignancy in any hysterectomy specimens.  So I am also early, but serous type.   My follwo up visits include a physical exam, a pelvic exam and interview.  No blood work, no scans.  I have had a cough, hip and back pain, and now weight loss (I have been trying to lose weight after back surgery to reduce the pain which is working).  So i have had some symptoms of recurrence and still no scans.   All of my problems so far have resolved.  

Your MD seems to feel that the greatest problem is your Lynch syndrome and weight loss.  I would get the colonoscopy as soon as you can.  And hopefully it will be nothing.  

My cancer was Stage IVB, Grade 2, with LVSI and positive pelvic wash,and after treatment my gyn/onc told me that NCCN guidelines were pelvic exams every 3 months for 3 years, then 6 months thereafter.  She said no bloodwork or scans were indicated, and that symptoms would catch recurrence just as quickly as scans.  Off the record, she told me that it was not unreasonable of me to ask for a scan each year due to the advanced disease I had.  I have kept my pelvic exam appointments, and requested and gotten a scan each anniversary.  I was diagnosed in April 2017 and finished treatment October 2017.  Just wanted to let you know that it's not unusual for your doc to have the followup he does. HOWEVER, I agree with the others that you need to do the colonoscopy asap for your own peace of mind, and if you have an uneasy feeling, go get a second opinion.  You know your body and you deserve to have your questions answered.