1. Can you better explain the situation. Did you make an application for Indefinite Leave to Remain or citizenship whilst you were in the UK? Are you aware that the UK is leaving the EU?
2. Dear Antonio, I regret to say that once you have been out of the UK for over one year, without visiting the UK you lose any acquired rights you may have had to live and work in the UK. In order to have acquired rights to live and work in the UK indefinitely, you would have had to either obtained Indefinite Leave to Remain or to have taken out citizenship. You can now return to the UK, but you will be starting again in acquiring the necessary five years (not six) for EU nationals to acquire citizenship or Indefinite Leave to Remain.
3. I would also advise you this time to apply for Permanent Residence card which verifys that you have the right to live and work in the UK. This card is provided to EU nationals to evidence the fact they can live in the UK without restriction. Additionally, you should take out private health insurance as this is necessary if you want to acquire either ILR or citizenship.
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5. You have to be a minimum of three months in the UK before you can apply for a Permanent Residence card. This is because after three months have elapsed you have to exercise EU Treaty rights to remain in the UK. Normally, they are issued after you show you are six months resident in the UK BECAUSE, you are then resident for tax in the UK. So, I would suggest you wait until you are six months in the UK.