Hi Anjac,
Medications from Yeson are very strong and effective. You really don't need extra medications with you. Please don't overdose on cough medications or they wouldn't work. If it makes you feel better, just take it with you but do not use it.
For your cough and AB, just contact Yeson for better advice. Exchange your money at the airport it is easier and safer.
Remember that water almost always works instantly to reduce coughing spell because it lubricates dry mucous membrane and thins out phlegm. Teach your brain from now on that water WILL work, ha-ha.
I asked anesthesiologist prior to surgery about anesthetics. Yeson uses Propofol which is a safe, quick and short acting drug. Once they stop the drip you will wake up quickly with no after effects. You will meet anesthesiologist right before surgery in your room. You can ask as many questions as you want.
From ICN to Phillhouse, I think, you should take the bus and then a cab. It would be easier and cheaper to reach to Phillhouse and you don't need to look for it. Make sure you print out Phillhouse address in both Korean and English. Also, print out the confirmation and instructions document sent to you by Jessie. It contains Yeson address in both languages. I highlighted that address with a yellow highlighter and made a few copies. I just showed highlighted portion to cab drivers and had no problem. From Phil to Yeson it is only $10 and a quick ride.
I didn't use subway because I was scared to get lost. However, subway stop and Taxi stand are just 3 to 4 minutes' walk to Phillhouse or even less. I traveled once by subway there but with another lady who was living at Phill and worked in Korea and it was very smooth and quick ride. All the passengers are well behaved and no one talks to anyone, very quiet ride; Stops signs are in both languages (English/Korean).
There is a 24 hour shop right underneath Phillhouse. I bought eight bottles 1.5 or 2 liters each and that was enough for me. They have a lot of stuff in that shop. There is another strip of shops just across the subway stop and you can buy almost everything there (organic vegies, fruits, eggs, house hold items etc.). You can ask Phillhouse especially Massie for directions to these places. Massie speaks English and she is very helpful. There is a huge park right next to Phillhouse, beautiful to walk.
Yes you do have Wi-Fi at Phillouse and at Yeson. Phillhouse has a couple of computers downstairs for you to use if you need. Accommodation @ Phill is ok and not bad at all and is cheap compare to other places.
I had no problem using my credit card at yeson you just need to sign the transaction. I used my CC for the Botox and gave cash for surgery. Just remember, if you use CC there would be an extra charge for international transaction.
If you need my help while there and want to contact me via email the let me know I'll give you my email address. Best wishes