Numerous individuals grapple with chronic or recurrent pain, prompting the exploration for non-pharmacological remedies in human-computer interaction. Redirecting attention from nociceptive signals can effectively alleviate pain, but the path through fine tactile perception is rarely explored. This paper introduce Electronic Tactile Flow, a novel interaction paradigm utilizing an 8*8 electrotactile array to modulate pain through cognitive engagement and Flow theory. We investigated the analgesic effects of top-down (goal-directed) versus bottom-up (stimulus-driven) attention. Results from our user study (N=42) indicate that top-down engagement significantly reduces pain perception compared to passive stimulation. Furthermore, we implemented an adaptive difficulty mechanism that sustains users in an optimal Flow state, which was found to amplify pain relief and immersion. This work presents the first integration of electrotactile interfaces with attentional modulation, offering a promising framework for designing personalized, cognitively interactive pain interventions in HCI.