I may have damaged my electrical system. Please advise me. Thank you, Carl ---

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After leaving my parking lights on and totally draining my good battery, I jumped my 1985 Honda Accord SEi 1.8L (F/I) ES3 A/T Sedan. After hooking up the cables to both cars, I left the Mercedes running for about 20-30 minutes as the '85 Honda would not start--NOT A CLICK!! I was mystified. I checked the connections, and they were warm on the M-B. The sealed battery in the '85 Honda was so HOT that I could not leave my palm in contact on it's side. It was hissing, and I shut everything down. Voltage in the hot battery was 2.3 V. I thought I had ruined it. The next day I put it on a charger, and it came up to 12.8 V. and held it. AMAZING--. It was O.K. The Honda still would not turn over. I checked the Fuses in the PDC next to the battery, and one 65 Amp Main Fuse (thin, metal link 3/8" x 3") was melted/ blown. I "jury-rigged" that temporarily, and the car starts fine. Now, my problem is that I have no Dash lights. What other damage could I have done? Thank you guys so much for your past help. --- Carl -------