22M Diagnosed with Lymphoma Stage 3S. Confused and Worried

22M had cervical nodes for 2-3 years, very weird clinical history + dismissive behavior of doctors condition remain undiagnosed. Now finally with the help of a good pathologist after biopsy + ihc + later pet I have been diagnosed with classic stage 3 hogdkin lymphoma.
Now here is the thing, when the pathologist suspected lymphoma he referred us to Delhi State Cancer Institute where around 1.5 months of time was wasted with zero productivity they couldn't reach a diagnosis everything was super slow, whereas when we reached back to the pathologist with our problem it took us just 15 more days to get the diagnosis.
Here is the thing the diagnosis + biopsy was done in Ujala and father trusts them now and that is where he wants to get the treatment done.
When i did some research I found out that for stage 3 cHL Nivo-AVD is that standard most successful approach. Also luckily there is a indian biosimilar Tishtha which is only 1/4 the cost. The question is where should I get the treatment, I am worried what is the during transportation the chain is broken, and the chemical is not longer effective. I know it might be a little stupid but I genuinely don't want to die for nothing. Is in general transportation of these substances to even tier 2-3 towns considered reliable?
Where can i get reliable treatment in india, if possible north side? anyone else who has experience with cHL and Nivo-AVD treatment in india let me know. Thanks a lot :)

Also as a side note, around 1.5 years ago, i was given linezolid and clinmacydin for 1.5 months, during this the node sizes went down significantly, though some nodes still remained, immediately after the treatment stopped the nodes increased in size, so possibly not coincidental waxing and waning as typically seen in cHL. Is this weird? could this be infection + cHL, I will mention this to my onco in next meeting. Also the progression has been slow? as in the nodes have persisted for around 2 years now. No type B symptoms

Also i know this is sort of unrelated to the sub but i am guessing you guys will have good ideas into ins and outs. Plus i am joining med school this year aswell. Infact have joined already. So yeah.. idk if that helps. But if you guys know anything about anything above please let me know thanks again :)